OpenGL 3.x screenshots are now processed

src/qt/qt_renderercommon.hpp

@@ -36,6 +36,8 @@ public:
     virtual void reloadOptions() { }
     /* Make the renderer reload itself */
     virtual bool reloadRendererOption() { return false; }
+    /* Should the renderer take screenshots itself? */
+    virtual bool rendererTakeScreenshot() { return false; }
 
     int      r_monitor_index = 0;