Remove wxGTK-specific commented out code in wxHeaderCtrl

No real changes, just remove some commented out code add back in 2009 by
6a2a30a8aa.

src/generic/headerctrlg.cpp

@@ -484,11 +484,6 @@ void wxHeaderCtrl::OnPaint(wxPaintEvent& WXUNUSED(event))
     int w, h;
     GetClientSize(&w, &h);
 
-#ifdef __WXGTK__
-//    int vw;
-//    GetVirtualSize(&vw, NULL);
-#endif
-
     wxAutoBufferedPaintDC dc(this);
     dc.Clear();
 
@@ -539,7 +534,6 @@ void wxHeaderCtrl::OnPaint(wxPaintEvent& WXUNUSED(event))
 #ifdef __WXGTK__
         if (i == count-1 && xpos + colWidth >= w)
         {
-//            colWidth = wxMax( colWidth, vw - xpos );
             state |= wxCONTROL_DIRTY;
         }
 #endif