[proposal] gdb/testsuite/gdb.signal

[Michael Chastain]

Well, Mark Kettenis was also opposed to gdb.signal,
so I've dropped the proposal.

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> > (1) Setup gdb.signals and mechanically move the signals files there.
> >     I would do this part, to make sure the mechanical move went okay.
> > 
> > (2) Seek a new senior maintainer for the new gdb.signal.  I would keep
> >     the maintainership until someone volunteers and is approved.