Disconnect all GTK signals referencing a wx object which is being destructed

or which is destroying the associated GTK object


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72696 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/slider.h

@@ -30,6 +30,7 @@ public:
         Create( parent, id, value, minValue, maxValue,
                 pos, size, style, validator, name );
     }
+    ~wxSlider();
 
     bool Create(wxWindow *parent,
                 wxWindowID id,