Fix crash when closing app on iphone

platform/iphone/os_iphone.cpp

@@ -356,14 +356,32 @@ void OSIPhone::delete_main_loop() {
 
 void OSIPhone::finalize() {
 
-	if (main_loop) // should not happen?
-		memdelete(main_loop);
+	delete_main_loop();
+
+	memdelete(input);
+	memdelete(ios);
+
+#ifdef GAME_CENTER_ENABLED
+	memdelete(game_center);
+#endif
+
+#ifdef STOREKIT_ENABLED
+	memdelete(store_kit);
+#endif
+
+#ifdef ICLOUD_ENABLED
+	memdelete(icloud);
+#endif
 
 	visual_server->finish();
 	memdelete(visual_server);
 	//	memdelete(rasterizer);
 
-	memdelete(input);
+	// Free unhandled events before close
+	for (int i = 0; i < MAX_EVENTS; i++) {
+		event_queue[i].unref();
+	};
+	event_count = 0;
 };
 
 void OSIPhone::set_mouse_show(bool p_show){};