new macro LUA_COMPAT to control some compatibility macros

luaconf.h

@@ -1,5 +1,5 @@
 /*
-** $Id: luaconf.h,v 1.97 2008/04/07 18:58:42 roberto Exp roberto $
+** $Id: luaconf.h,v 1.98 2008/06/25 15:27:12 roberto Exp roberto $
 ** Configuration file for Lua
 ** See Copyright Notice in lua.h
 */
@@ -323,6 +323,14 @@
 
 
 
+/*
+@@ LUA_COMPAT includes some macros and functions that supply some
+@* compatibility with previous versions.
+** CHANGE it (undefine it) if you do not need these compatibility facilities.
+*/
+#define LUA_COMPAT
+
+
 /*
 @@ LUA_COMPAT_VARARG controls compatibility with old vararg feature.
 ** CHANGE it to undefined as soon as your programs use only '...' to