Replace signals with Q_SIGNALS

src/globalshortcuts/globalshortcut.h

@@ -50,7 +50,7 @@ class GlobalShortcut : public QObject, QAbstractNativeEventFilter {
   bool setShortcut(const QKeySequence &shortcut);
   bool unsetShortcut();
 
- signals:
+ Q_SIGNALS:
   void activated();
 
  private:

src/globalshortcuts/globalshortcutsbackend.h

@@ -54,7 +54,7 @@ class GlobalShortcutsBackend : public QObject {
 
   bool is_active() const { return active_; }
 
- signals:
+ Q_SIGNALS:
   void RegisterFinished(const bool success);
 
  protected:

src/globalshortcuts/globalshortcutsmanager.h

@@ -77,7 +77,7 @@ class GlobalShortcutsManager : public QWidget {
   void ReloadSettings();
   void ShowMacAccessibilityDialog();
 
- signals:
+ Q_SIGNALS:
   void Play();
   void Pause();
   void PlayPause();