Make wxDataViewCtrl::GetBestSize() return a height of 80 on OSX as per the other platforms

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59402 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/carbon/dataview.h

@@ -508,6 +508,8 @@ public:
 // implementation
 //
 
+  virtual wxSize DoGetBestSize() const;
+
  // adds all children of the passed parent to the control; if 'parentItem' is invalid the root(s) is/are added:
   void AddChildrenLevel(wxDataViewItem const& parentItem);