Workaround for GTK+ sensitivity bug

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58194 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/spinbutt.h

@@ -45,6 +45,8 @@ public:
     static wxVisualAttributes
     GetClassDefaultAttributes(wxWindowVariant variant = wxWINDOW_VARIANT_NORMAL);
     
+    virtual bool Enable( bool enable = true );
+
     // implementation
     void OnSize( wxSizeEvent &event );