FYI: clean up gdb.modula2

[Gaius Mulley]

Tom Tromey <tromey@redhat.com> writes:

> I'm checking this in.
>
> This changes gdb.modula2 to use standard_testfile and prepare_for_testing.
>
> Regtested on x86-64 Fedora 16.
>
> Tom

thanks,
Gaius