minor amend

3rd/lua/README

@@ -1,5 +1,6 @@
 This is a modify version of lua 5.3.1 (http://www.lua.org/ftp/lua-5.3.1.tar.gz) .
 
-For detail : http://lua-users.org/lists/lua-l/2014-03/msg00489.html
-
-
+For detail , 
+  Shared Proto : http://lua-users.org/lists/lua-l/2014-03/msg00489.html
+  Shared short string table : http://blog.codingnow.com/2015/08/lua_vm_share_string.html
+  

3rd/lua/lstring.h

@@ -43,6 +43,8 @@ LUAI_FUNC Udata *luaS_newudata (lua_State *L, size_t s);
 LUAI_FUNC TString *luaS_newlstr (lua_State *L, const char *str, size_t l);
 LUAI_FUNC TString *luaS_new (lua_State *L, const char *str);
 
+#define ENABLE_SHORT_STRING_TABLE
+
 LUA_API void luaS_initshr();
 LUA_API void luaS_exitshr();
 LUA_API void luaS_expandshr(int n);

skynet-src/luashrtbl.h

@@ -1,11 +1,10 @@
 #ifndef LUA_SHORT_STRING_TABLE_H
 #define LUA_SHORT_STRING_TABLE_H
 
-#ifndef DISABLE_SHORT_STRING
-
 #include "lstring.h"
 
-#else
+// If you use modified lua, this macro would be defined in lstring.h
+#ifndef ENABLE_SHORT_STRING_TABLE
 
 static inline int luaS_shrinfo(lua_State *L) { return 0; }
 static inline void luaS_initshr() {}