Restore wxBusyCursor::Get{Story,Busy}Cursor() in wxGTK.

Even if these methods are completely useless, we still need to keep them in
wxGTK 3.0 for ABI compatibility.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75771 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/utils.h

@@ -751,11 +751,7 @@ public:
     ~wxBusyCursor()
         { wxEndBusyCursor(); }
 
-    // FIXME: These two methods are currently only implemented (and needed?)
-    //        in wxGTK.  BusyCursor handling should probably be moved to
-    //        common code since the wxGTK and wxMSW implementations are very
-    //        similar except for wxMSW using HCURSOR directly instead of
-    //        wxCursor..  -- RL.
+    // Obsolete internal methods, do not use.
     static const wxCursor &GetStoredCursor();
     static const wxCursor GetBusyCursor();
 };