contribs: fix lua compile on cygwin/mingw/win32

extras/contrib/src/Makefile

@@ -573,7 +573,7 @@ lua: lua-$(LUA_VERSION).tar.gz
 
 .lua: lua
 ifdef HAVE_WIN32
-	( cd $<; sed -i.orig 's/lua luac/lua.exe/' Makefile ; cd src; sed -i.orig 's/gcc/$(CC)/' Makefile; cd ../..;)
+	( cd $<; sed -i.orig 's/lua luac/lua.exe/' Makefile ; cd src; sed -i.orig 's/CC=/#CC=/' Makefile; cd ../..;)
 	(cd $<; $(HOSTCC) make $(LUA_MAKEPLATEFORM); cd src; $(HOSTCC) make liblua.a; cd ..;$(HOSTCC) make install INSTALL_TOP=$(PREFIX))
 else 
 	(cd $<; $(HOSTCC) make $(LUA_MAKEPLATEFORM) && make install INSTALL_TOP=$(PREFIX))