added destructor (correction for Mac OS X)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9715 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/choice.h

@@ -36,6 +36,9 @@ class WXDLLEXPORT wxChoiceBase : public wxControlWithItems
 {
 public:
     // all generic methods are in wxControlWithItems
+#ifdef __WXMAC_X__
+    virtual ~wxChoiceBase() {}
+#endif
 
     // single selection logic
     virtual void SetSelection(int n) = 0;