use wxUIntPtr instead of long for 3rd parameter of wxListCtrl::SortItems() to allow passing pointers to it

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@60182 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/private/listctrl.h

@@ -610,7 +610,7 @@ public:
     void InsertItem( wxListItem &item );
     void InsertColumn( long col, wxListItem &item );
     int GetItemWidthWithImage(wxListItem * item);
-    void SortItems( wxListCtrlCompare fn, long data );
+    void SortItems( wxListCtrlCompare fn, wxUIntPtr data );
 
     size_t GetItemCount() const;
     bool IsEmpty() const { return GetItemCount() == 0; }