minor fixes for conditional build targets

engine/src/shell/platform/unity/uiwidgets_system.h

 #pragma once
 
 #ifdef __APPLE__
-#include "shell/platform/unity/darwin/macos/uiwidgets_system.h"
+    #ifdef TARGET_OS_IOS
+        #include "shell/platform/unity/darwin/ios/uiwidgets_system.h"
+    #else
+        #include "shell/platform/unity/darwin/mac/uiwidgets_system.h"
+    #endif
-#include "shell/platform/unity/windows/uiwidgets_system.h"
+    #include "shell/platform/unity/windows/uiwidgets_system.h"
 #endif