This is done in preparation for adding a new wxCursor method and will allow us
to define it in a single place by default instead of having to provide stubs
for all ports.
See #16539.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78133 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775