added patch for theme savvy checkbox metrics

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15173 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/mac/checklst.h

@@ -58,6 +58,11 @@ public:
   void OnChar(wxKeyEvent& event) ;
   void OnLeftClick(wxMouseEvent& event) ;
 
+	// metrics
+	wxInt32 m_checkBoxWidth;
+    wxInt32 m_checkBoxHeight;
+	wxInt32	m_TextBaseLineOffset;
+	
     // the array containing the checked status of the items
     wxArrayInt m_checks;