added check for GTK 1.2

added symbol __WXGTK12__  (do not use GTK_MINOR_VERSION in your code
    as this is undefined anywhere outside wxGTK itself)
  updated wxGTK.spec for local builds
  fixed clipboard clear/setdata race
  test for wxConvLocal in dialogs sample


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2291 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/dialogs/dialogs.cpp

@@ -47,6 +47,10 @@ MyCanvas *myCanvas = (MyCanvas *) NULL;
 // `Main program' equivalent, creating windows and returning main app frame
 bool MyApp::OnInit(void)
 {
+#if defined(__WXGTK__) && defined(wxUSE_UNICODE)
+  wxConvCurrent = &wxConvLocal;
+#endif
+
   m_canvasTextColour = wxColour("BLACK");
   m_canvasFont = *wxNORMAL_FONT;