fix qt5 build

Zhao Yuhang

2023-12-14 ca6ba7d7aa547b4e0c8d86fb9e00f25374a181db

 src/core/contexts/cocoawindowcontext_p.h

@@ -17,6 +17,9 @@

    protected:
        bool setupHost() override;

    protected:
        WId windowId = 0;
    };

}