libXext/buildlink3.mk, now that it is included there.
Leave the places where its API version is set or variables from it
are used directly (about 3 packages).
the dockapp area. It consumes very little resources. It is useful in
conjunction with a window manager that allows maximised windows to be
prevented from covering the dockapp area; it allows access to the root
window or menu even when windows are maximised.