fix qt5 build

Zhao Yuhang

2023-12-14 ca6ba7d7aa547b4e0c8d86fb9e00f25374a181db

 src/widgets/widgetwindowagent_p.h

@@ -16,8 +16,14 @@

        // Host
        QWidget *hostWidget{};

#ifdef Q_OS_WINDOWS
        void setupWindows10BorderWorkaround();
#elif defined(Q_OS_MACOS)
        void setupMacOSTitleBar(QWidget *titleBar);
#endif
    };

}

#endif // WIDGETWINDOWAGENTPRIVATE_H
#endif // WIDGETWINDOWAGENTPRIVATE_H