Implemented a simple modality under X11.

Filled wxDataFormat and wxDataObject etc.
  Added skeleton for X11 clipboard.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@14370 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/minimal/minimal.cpp

@@ -174,9 +174,6 @@ MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 
 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 {
-    char *test = NULL;
-    *test = 0;
-
     // TRUE is to force the frame to close
     Close(TRUE);
 }