Change the way the lua engine initialization functions are called

luprex/cpp/core/source.cpp

@@ -434,6 +434,7 @@ eng::string SourceDB::rebuild_module(const eng::string &mod) {
 }
 
 void SourceDB::init(lua_State *L) {
+    register_lua_builtins();
     lua_state_ = L;
     LuaVar globtab, persist, unpersist, classname, classtab, funcname, funcp, rawfunc, nullstring;
     LuaExtStack LS(L, globtab, persist, unpersist, classname, classtab, funcname, funcp, rawfunc, nullstring);
@@ -508,6 +509,10 @@ void SourceDB::deserialize_source(util::LuaSourceVec *sv, StreamBuffer *sb) {
 // print out an error.
 //
 void SourceDB::register_lua_builtins() {
+    static bool initialized = false;
+    if (initialized) return;
+    initialized = true;
+
     lua_State *L = LuaCoreStack::newstate(nullptr);
     luaL_openlibs(L);
     {