Revert "Use QMenuBar instead of own global menu implementation on Linux"

This reverts commit 79f96480c2.

Telegram/SourceFiles/platform/linux/linux_wayland_integration_dummy.cpp

@@ -44,5 +44,11 @@ bool WaylandIntegration::skipTaskbarSupported() {
 void WaylandIntegration::skipTaskbar(QWindow *window, bool skip) {
 }
 
+void WaylandIntegration::registerAppMenu(
+		QWindow *window,
+		const QString &serviceName,
+		const QString &objectPath) {
+}
+
 } // namespace internal
 } // namespace Platform