intltool-* scripts in CLEANFILES breaks build of gnome-control-center

[Darin Adler <darin bentspoon com>]

The intltool-merge script and others like it are created by configure. But
gnome-control-center lists them in CLEANFILES. This means that if you make
clean, subsequent make will fail. I think these should go in DISTCLEANFILES
or something like that instead. Or we can do as they do in other modules and
just don't list them at all.

    -- Darin