fixed mingw libraries static compilation

src/Engine.cpp

@@ -101,7 +101,7 @@ void Engine::updateGameObjects(f64 deltaTime){
 game::GameObject& Engine::createGameObject(){
     auto pair = gameObjectPool.emplace(game::GameObject(mono.createObject(gameObjectClass)));
     game::GameObject& obj = pair.second;
-    gameObjectCtor(obj.getObjectHandle().getObject(), obj_id++, pair.first);
+    gameObjectCtor(obj.getObjectHandle().getObject(), ++obj_id, pair.first);
     return obj;
 }