Core: Use Qt5-style connects

The heavy lifting was done by clazy.

Change-Id: I2dde14919d917816d02117338205f8f861d8af0a
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/coreplugin/vcsmanager.h

@@ -100,13 +100,12 @@ signals:
 public slots:
     static void clearVersionControlCache();
 
-private slots:
-    void handleConfigurationChanges();
-
 private:
     explicit VcsManager(QObject *parent = 0);
     ~VcsManager();
 
+    void handleConfigurationChanges();
+
     friend class Core::Internal::MainWindow;
 };