libs: modified Lua release for POSIX requirement

lua/README

@@ -3,3 +3,7 @@ This is Lua 5.4.3, released on 15 Mar 2021.
 
 For installation instructions, license details, and
 further information about Lua, see doc/readme.html.
+
+This is a slightly modified version for ET: Legacy.
+The src/Makefile file has been adjusted to fit our
+posix and posix32bit requirements.

lua/src/Makefile

@@ -7,7 +7,7 @@
 PLAT= guess
 
 CC= gcc -std=gnu99
-CFLAGS= -O2 -Wall -Wextra -DLUA_COMPAT_5_3 $(SYSCFLAGS) $(MYCFLAGS)
+CFLAGS= -O2 -Wall -Wextra $(SYSCFLAGS) $(MYCFLAGS)
 LDFLAGS= $(SYSLDFLAGS) $(MYLDFLAGS)
 LIBS= -lm $(SYSLIBS) $(MYLIBS)
 
@@ -30,7 +30,7 @@ CMCFLAGS=
 
 # == END OF USER SETTINGS -- NO NEED TO CHANGE ANYTHING BELOW THIS LINE =======
 
-PLATS= guess aix bsd c89 freebsd generic linux linux-readline macosx mingw posix solaris
+PLATS= guess aix bsd c89 freebsd generic linux linux-readline macosx mingw posix posix32bit solaris
 
 LUA_A=	liblua.a
 CORE_O=	lapi.o lcode.o lctype.o ldebug.o ldo.o ldump.o lfunc.o lgc.o llex.o lmem.o lobject.o lopcodes.o lparser.o lstate.o lstring.o ltable.o ltm.o lundump.o lvm.o lzio.o
@@ -135,7 +135,10 @@ mingw:
 	$(MAKE) "LUAC_T=luac.exe" luac.exe
 
 posix:
-	$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_POSIX"
+	$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_POSIX -fPIC -DLUA_USE_DLOPEN" SYSLIBS="-ldl"
+
+posix32bit:
+	$(MAKE) $(ALL) SYSCFLAGS="-m32 -DLUA_USE_POSIX -fPIC -DLUA_USE_DLOPEN" SYSLDFLAGS="-m32" SYSLIBS="-ldl"
 
 SunOS solaris:
 	$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_POSIX -DLUA_USE_DLOPEN -D_REENTRANT" SYSLIBS="-ldl"