Fixed build error messages

[deurk]

../src/mathlib.c: In function ‘PerpendicularVector’:
../src/mathlib.c:72:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
   VectorNormalizeFast(dst);
   ^
../src/mathlib.c:72:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
../src/net.c: In function ‘NetadrToSockadr’:
../src/net.c:242:11: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
  ((struct sockaddr_in*)s)->sin_addr.s_addr = *(int *)&a->ip;
           ^
../src/net.c: In function ‘SockadrToNetadr’:
../src/net.c:249:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
  *(int *)&a->ip = ((struct sockaddr_in *)s)->sin_addr.s_addr;
  ^
../src/net.c: In function ‘NET_GetTCPPacket_SV’:
../src/net.c:746:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
   message->cursize = BigShort(*(short*)st->inbuffer);
   ^
../src/net.c: In function ‘NET_GetLocalAddress’:
../src/net.c:1253:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
  if (!*(int*)out->ip) //socket was set to auto
  ^
../src/net.c:1254:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
   *(int *)out->ip = *(int *)adr.ip; //change it to what the machine says it is, rather than the socket.
   ^
../src/net.c:1254:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
../src/net.c:1235:8: warning: variable ‘notvalid’ set but not used [-Wunused-but-set-variable]
  qbool notvalid = false;
        ^
../src/pr2_edict.c: In function ‘ED2_FindFieldOffset’:
../src/pr2_edict.c:54:19: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
    return f->ofs-((int)&(((edict_t *)0)->v));
                   ^
../src/sv_demo.c: In function ‘SV_MVD_Record’:
../src/sv_demo.c:1105:21: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
   memset(&demo, 0, ((int)&(((demo_t *)0)->mem_set_point)));
                     ^
../src/sv_phys.c: In function ‘SV_CheckVelocity’:
../src/sv_phys.c:96:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
   if (IS_NAN(ent->v.velocity[i]))
   ^
../src/sv_phys.c:101:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
   if (IS_NAN(ent->v.origin[i]))
   ^
../src/vfs_os.c: In function ‘FSOS_ReadFile’:
../src/vfs_os.c:249:7: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result]
  fread(buffer, 1, loc->len, f);
       ^
../src/sv_main.c: In function ‘Rcon_Validate’:
../src/sv_main.c:1514:3: warning: pointer targets in passing argument 1 of ‘SHA1_Update’ differ in signedness [-Wpointer-sign]
   SHA1_Update((unsigned char*)Cmd_Argv(0));
   ^
In file included from ../src/qwsvdef.h:76:0,
                 from ../src/sv_main.c:22:
../src/sha1.h:61:6: note: expected ‘char *’ but argument is of type ‘unsigned char *’
 void SHA1_Update (char* data);
      ^
../src/sv_main.c:1515:3: warning: pointer targets in passing argument 1 of ‘SHA1_Update’ differ in signedness [-Wpointer-sign]
   SHA1_Update((unsigned char*)" ");
   ^
In file included from ../src/qwsvdef.h:76:0,
                 from ../src/sv_main.c:22:
../src/sha1.h:61:6: note: expected ‘char *’ but argument is of type ‘unsigned char *’
 void SHA1_Update (char* data);
      ^
../src/sv_main.c:1516:3: warning: pointer targets in passing argument 1 of ‘SHA1_Update’ differ in signedness [-Wpointer-sign]
   SHA1_Update((unsigned char*)password1);
   ^
In file included from ../src/qwsvdef.h:76:0,
                 from ../src/sv_main.c:22:
../src/sha1.h:61:6: note: expected ‘char *’ but argument is of type ‘unsigned char *’
 void SHA1_Update (char* data);
      ^
../src/sv_main.c:1517:3: warning: pointer targets in passing argument 1 of ‘SHA1_Update’ differ in signedness [-Wpointer-sign]
   SHA1_Update((unsigned char*)Cmd_Argv(1) + DIGEST_SIZE * 2);
   ^
In file included from ../src/qwsvdef.h:76:0,
                 from ../src/sv_main.c:22:
../src/sha1.h:61:6: note: expected ‘char *’ but argument is of type ‘unsigned char *’
 void SHA1_Update (char* data);
      ^
../src/sv_main.c:1518:3: warning: pointer targets in passing argument 1 of ‘SHA1_Update’ differ in signedness [-Wpointer-sign]
   SHA1_Update((unsigned char*)" ");
   ^
In file included from ../src/qwsvdef.h:76:0,
                 from ../src/sv_main.c:22:
../src/sha1.h:61:6: note: expected ‘char *’ but argument is of type ‘unsigned char *’
 void SHA1_Update (char* data);
      ^
../src/sv_main.c:1520:4: warning: pointer targets in passing argument 1 of ‘SHA1_Update’ differ in signedness [-Wpointer-sign]
    SHA1_Update((unsigned char*)Cmd_Argv(i));
    ^
In file included from ../src/qwsvdef.h:76:0,
                 from ../src/sv_main.c:22:
../src/sha1.h:61:6: note: expected ‘char *’ but argument is of type ‘unsigned char *’
 void SHA1_Update (char* data);
      ^
../src/sv_main.c:1521:4: warning: pointer targets in passing argument 1 of ‘SHA1_Update’ differ in signedness [-Wpointer-sign]
    SHA1_Update((unsigned char*)" ");
    ^
In file included from ../src/qwsvdef.h:76:0,
                 from ../src/sv_main.c:22:
../src/sha1.h:61:6: note: expected ‘char *’ but argument is of type ‘unsigned char *’
 void SHA1_Update (char* data);
      ^
../src/sv_main.c: In function ‘StringToFilter’:
../src/sv_main.c:1975:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
  f->mask = *(unsigned *)m;
  ^
../src/sv_main.c:1976:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
  f->compare = *(unsigned *)b;
  ^
../src/sv_main.c: In function ‘SV_ListIPVIP_f’:
../src/sv_main.c:2060:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
   *(unsigned *)b = ipvip[i].compare;
   ^
../src/sv_main.c: In function ‘SV_WriteIPVIP_f’:
../src/sv_main.c:2090:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
   *(unsigned *)b = ipvip[i].compare;
   ^
../src/sv_main.c: In function ‘SV_ListIP_f’:
../src/sv_main.c:2204:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
   *(unsigned *)b = ipfilters[i].compare;
   ^
../src/sv_main.c: In function ‘SV_WriteIP_f’:
../src/sv_main.c:2246:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
   *(unsigned *)b = ipfilters[i].compare;
   ^
../src/sv_main.c:2260:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
   *(unsigned *)b = ipfilters[i].compare;
   ^
../src/sv_main.c: In function ‘SV_FilterPacket’:
../src/sv_main.c:2297:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
  in = *(unsigned *)net_from.ip;
  ^
../src/sv_main.c: In function ‘Do_BanList’:
../src/sv_main.c:2321:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
   *(unsigned *)b = ipfilters[i].compare;
   ^
../src/sv_main.c: In function ‘SV_Cmd_Banip_f’:
../src/sv_main.c:2572:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
  *(unsigned *)b = f.compare;
  ^
../src/sv_main.c: In function ‘SV_Cmd_Banremove_f’:
../src/sv_main.c:2618:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
  *(unsigned *)b = ipfilters[id].compare;
  ^
../src/sv_main.c: In function ‘SV_VIPbyIP’:
../src/sv_main.c:2637:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
  in = *(unsigned *)adr.ip;
  ^
../src/vfs_pak.c: In function ‘FSPAK_LoadPackFile’:
../src/vfs_pak.c:297:6: warning: variable ‘read’ set but not used [-Wunused-but-set-variable]
  int read;
      ^
../src/pcre/pcre.c: In function ‘pcre_compile’:
../src/pcre/pcre.c:5596:28: warning: ‘reqbyte’ may be used uninitialized in this function [-Wmaybe-uninitialized]
   re->req_byte = ((reqbyte & REQ_CASELESS) != 0 &&
                            ^
../src/pcre/pcre.c:5574:8: warning: ‘firstbyte’ may be used uninitialized in this function [-Wmaybe-uninitialized]
     if (firstbyte < 0)
        ^