feature: luajit.h: defined the macro OPENRESTY_LUAJIT for our branch of LuaJIT.

OpenResty and other projects can test this macro to utilize unique
features of this LuaJIT while still keeping compatibility with the
official LuaJIT.

Author: agentzh

README

@@ -31,6 +31,9 @@ since we still synchronize any upstream changes all the time.
 We introduce our own changes which will never merge or haven't yet merged into
 the upstream LuaJIT (https://github.com/LuaJIT/LuaJIT), which are
 
+* feature: luajit.h: defined the macro OPENRESTY_LUAJIT for our branch of
+  LuaJIT.
+
 * feature: implemented the table.clone() builtin Lua API.
 
     This change only support shallow clone. e.g

src/luajit.h

@@ -30,6 +30,8 @@
 
 #include "lua.h"
 
+#define OPENRESTY_LUAJIT
+
 #define LUAJIT_VERSION		"LuaJIT 2.1.0-beta3"
 #define LUAJIT_VERSION_NUM	20100  /* Version 2.1.0 = 02.01.00. */
 #define LUAJIT_VERSION_SYM	luaJIT_version_2_1_0_beta3