Don't use Qt keywords in headers

Unfortunately for many Wayland features applications need to access
Qt private headers which will fail if the project is built with
QT_NO_KEYWORDS.

Ideally, the examples and tests were ported, too, and QT_NO_KEYWORDS
enabled in .cmakec.conf.

Pick-to: 6.7
Change-Id: I9f988d304bcc8dba4dd84761c41ba3da2473515d
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

src/plugins/platforms/wayland/qwaylanddisplay_p.h

@@ -249,11 +249,11 @@ public:
 
     void initEventThread();
 
-public slots:
+public Q_SLOTS:
     void blockingReadEvents();
     void flushRequests();
 
-signals:
+Q_SIGNALS:
     void reconnected();
     void globalAdded(const RegistryGlobal &global);
     void globalRemoved(const RegistryGlobal &global);

src/plugins/platforms/wayland/qwaylandinputdevice_p.h

@@ -258,7 +258,7 @@ public:
     }
 #endif
 
-private slots:
+private Q_SLOTS:
     void handleFocusDestroyed();
     void handleFocusLost();
 
@@ -314,7 +314,7 @@ protected:
     void pointer_axis_value120(uint32_t axis, int32_t value120) override;
     void pointer_axis_relative_direction(uint32_t axis, uint32_t direction) override;
 
-private slots:
+private Q_SLOTS:
     void handleFocusDestroyed() { invalidateFocus(); }
 
 private:

src/plugins/platforms/wayland/qwaylandprimaryselectionv1_p.h

@@ -69,7 +69,7 @@ public:
 
     QMimeData *mimeData() const { return m_mimeData; }
 
-signals:
+Q_SIGNALS:
     void cancelled();
 
 protected:

src/plugins/platforms/wayland/qwaylandsurface_p.h

@@ -41,12 +41,12 @@ public:
 
     static QWaylandSurface *fromWlSurface(::wl_surface *surface);
 
-signals:
+Q_SIGNALS:
     void screensChanged();
     void preferredBufferScaleChanged();
     void preferredBufferTransformChanged();
 
-private slots:
+private Q_SLOTS:
     void handleScreenRemoved(QScreen *qScreen);
 
 protected:

src/plugins/platforms/wayland/qwaylandwindow_p.h

@@ -237,10 +237,10 @@ public:
     virtual void reinit();
     void reset();
 
-public slots:
+public Q_SLOTS:
     void applyConfigure();
 
-signals:
+Q_SIGNALS:
     void wlSurfaceCreated();
     void wlSurfaceDestroyed();
 
@@ -335,7 +335,7 @@ protected:
 
     Qt::ScreenOrientation mLastReportedContentOrientation = Qt::PrimaryOrientation;
 
-private slots:
+private Q_SLOTS:
     void doApplyConfigureFromOtherThread();
 
 private: