Fix GacUI_HelloWorlds (NOT READY)

Tutorial/GacUI_HelloWorlds/Cpp/Main.cpp

@@ -1,11 +1,5 @@
 #define GAC_HEADER_USE_NAMESPACE
 #include <GacUI.h>
-#include <Windows.h>
-
-int CALLBACK WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int CmdShow)
-{
-	return SetupWindowsDirect2DRenderer();
-}
 
 void GuiMain()
 {