Amend efc0877f

Add the last `override`s.

src/frontends/qt/GuiView.h

@@ -223,7 +223,7 @@ Q_SIGNALS:
 
 public Q_SLOTS:
 	///
-	void setBusy(bool);
+	void setBusy(bool) override;
 	/// idle timeout.
 	/// clear any temporary message and replace with current status.
 	void clearMessage();

src/frontends/qt/GuiViewSource.h

@@ -55,7 +55,7 @@ public:
 
 protected:
 	///
-	void resizeEvent (QResizeEvent * event);
+	void resizeEvent (QResizeEvent * event) override;
 
 public Q_SLOTS:
 	///

src/frontends/qt/LayoutBox.h

@@ -46,7 +46,7 @@ public:
 		bool sorted, bool sortedByCat, bool unknown);
 
 	///
-	void showPopup();
+	void showPopup() override;
 
 	///
 	bool eventFilter(QObject * o, QEvent * e) override;