Export bit and FFI to script engine

Thanks to ForserX

Author: Xottab-DUTY

src/xrScriptEngine/script_engine.cpp

@@ -961,6 +961,8 @@ void CScriptEngine::init(ExporterFunc exporterFunc, bool loadGlobalNamespace)
     luajit::open_lib(lua(), LUA_OSLIBNAME, luaopen_os);
     luajit::open_lib(lua(), LUA_MATHLIBNAME, luaopen_math);
     luajit::open_lib(lua(), LUA_STRLIBNAME, luaopen_string);
+    luajit::open_lib(lua(), LUA_BITLIBNAME, luaopen_bit);
+    luajit::open_lib(lua(), LUA_FFILIBNAME, luaopen_ffi);
 #ifdef DEBUG
     luajit::open_lib(lua(), LUA_DBLIBNAME, luaopen_debug);
 #endif