Added wxExtDialog and sample.

Tried to make defs.h slightly more readable, also
    found some wrong flags then.
  Updated testconf.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2948 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/msgdlgg.h

@@ -38,7 +38,6 @@ public:
     void OnCancel(wxCommandEvent& event);
     
 private:
-    wxList  m_buttons;
     int     m_dialogStyle;
 
 DECLARE_EVENT_TABLE()