Add a TODO comment to wxGTK wxToolBar::FindToolForPosition().

Replace the out of date comment saying that GTK+ doesn't have a function to do
this with a TODO comment mentioning the name of the function which should be
used here.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76463 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/toolbar.cpp

@@ -696,7 +696,7 @@ wxSize wxToolBar::DoGetBestSize() const
 wxToolBarToolBase *wxToolBar::FindToolForPosition(wxCoord WXUNUSED(x),
                                                   wxCoord WXUNUSED(y)) const
 {
-    // VZ: GTK+ doesn't seem to have such thing
+    // TODO: implement this using gtk_toolbar_get_drop_index()
     wxFAIL_MSG( wxT("wxToolBar::FindToolForPosition() not implemented") );
 
     return NULL;