Added OS/2 patches to wxGTK.

Updated docs.
  Added wxMask code.
  Added Sylvain's newest tree ctrl code and sample.
  Corrected wxDC background colour (now as wrong as wxMSW).


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2767 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/app.cpp

@@ -28,13 +28,15 @@
 #include "wx/module.h"
 #include "wx/image.h"
 
+#if wxUSE_THREADS
 #include "wx/thread.h"
+#endif
 
 #include "unistd.h"
 
-#include <glib.h>
-#include <gdk/gdk.h>
-#include <gtk/gtk.h>
+#include "glib.h"
+#include "gdk/gdk.h"
+#include "gtk/gtk.h"
 
 #include "wx/gtk/win_gtk.h"