keep memory-error message in the global state, so that its use

does not depend on Lua internalizing strings to avoid a string
creation on memory errors

lmem.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lmem.h,v 1.34 2009/04/17 14:40:13 roberto Exp roberto $
+** $Id: lmem.h,v 1.35 2009/12/16 16:42:58 roberto Exp roberto $
 ** Interface to Memory Manager
 ** See Copyright Notice in lua.h
 */
@@ -13,8 +13,6 @@
 #include "llimits.h"
 #include "lua.h"
 
-#define MEMERRMSG	"not enough memory"
-
 
 #define luaM_reallocv(L,b,on,n,e) \
 	((cast(size_t, (n)+1) <= MAX_SIZET/(e)) ?  /* +1 to avoid warnings */ \