Quieten some noise in Win32 builds:

 - win32.h is included after <sys/socket.h>, so need to 
   set Win32SCK_IS_STDSCK earlier to avoid re-defined noise in XSUB.h
 - GCC (& MSVC?) have execv(...,const char *const *) so need a cast from char **.

p4raw-id: //depot/perlio@7971

doio.c

@@ -1300,9 +1300,9 @@ Perl_do_aexec5(pTHX_ SV *really, register SV **mark, register SV **sp,
 	if (*PL_Argv[0] != '/')	/* will execvp use PATH? */
 	    TAINT_ENV();		/* testing IFS here is overkill, probably */
 	if (really && *(tmps = SvPV(really, n_a)))
-	    PerlProc_execvp(tmps,PL_Argv);
+	    PerlProc_execvp(tmps,EXEC_ARGV_CAST(PL_Argv));
 	else
-	    PerlProc_execvp(PL_Argv[0],PL_Argv);
+	    PerlProc_execvp(PL_Argv[0],EXEC_ARGV_CAST(PL_Argv));
 	if (ckWARN(WARN_EXEC))
 	    Perl_warner(aTHX_ WARN_EXEC, "Can't exec \"%s\": %s",
 		PL_Argv[0], Strerror(errno));

perl.h

@@ -714,6 +714,10 @@ typedef struct perl_mstats perl_mstats_t;
 
 #include <errno.h>
 
+#if defined(WIN32) && (defined(PERL_OBJECT) || defined(PERL_IMPLICIT_SYS) || defined(PERL_CAPI))
+#  define WIN32SCK_IS_STDSCK		/* don't pull in custom wsock layer */
+#endif
+
 #if defined(HAS_SOCKET) && !defined(VMS) /* VMS handles sockets via vmsish.h */
 # include <sys/socket.h>
 # if defined(USE_SOCKS) && defined(I_SOCKS)
@@ -3442,6 +3446,10 @@ typedef struct am_table_short AMTS;
 #   include <libutil.h>		/* setproctitle() in some FreeBSDs */
 #endif
 
+#ifndef EXEC_ARGV_CAST
+#define EXEC_ARGV_CAST(x) x
+#endif
+
 /* and finally... */
 #define PERL_PATCHLEVEL_H_IMPLICIT
 #include "patchlevel.h"

toke.c

@@ -2718,7 +2718,7 @@ Perl_yylex(pTHX)
 		    else
 			newargv = PL_origargv;
 		    newargv[0] = ipath;
-		    PerlProc_execv(ipath, newargv);
+		    PerlProc_execv(ipath, EXEC_ARGV_CAST(newargv));
 		    Perl_croak(aTHX_ "Can't exec %s", ipath);
 		}
 #endif

win32/win32.h

@@ -554,5 +554,7 @@ EXTERN_C _CRTIMP ioinfo* __pioinfo[];
  */
 #include "win32iop.h"
 
+#define EXEC_ARGV_CAST(x) ((const char *const *) x)
+
 #endif /* _INC_WIN32_PERL5 */