Add Mac system button area interfaces

Sine Striker

2023-12-17 52a662ed17db6c3a3ff2050d61bc2e06ea21b056

 src/quick/quickwindowagent_p.h

@@ -16,6 +16,10 @@

        // Host
        QQuickWindow *hostWindow{};

#ifdef Q_OS_WINDOWS
        void setupWindows10BorderWorkaround();
#endif
    };

}