added SpinCtrl,

updated a few headers,
  tried to set window size hints, no effect with KWM,


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3926 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/spinctrl.h

@@ -52,6 +52,8 @@ protected:
 
 #if defined(__WXMSW__) && defined(__WIN32__)
     #include "wx/msw/spinctrl.h"
+#elif defined(__WXGTK__)
+    #include "wx/gtk/spinctrl.h"
 #else // Win16 || !Win
     #include "wx/generic/spinctrl.h"
 #endif // platform