eglfs: Add missing override

Change-Id: I257cfb29b919de5d4876d39e0512815c6ed24a88
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

src/plugins/platforms/eglfs/deviceintegration/eglfs_x11/qeglfsx11integration.cpp

@@ -55,7 +55,7 @@ public:
     EventReader(QEglFSX11Integration *integration)
         : m_integration(integration) { }
 
-    void run();
+    void run() override;
 
 private:
     QEglFSX11Integration *m_integration;