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GNU GDB's `gnu-nat.c` doesn't support *non-stop* mode.

Also, from <http://lists.gnu.org/archive/html/bug-hurd/2008-10/msg00045.html>,
GNU GDB's Pedro Alves:

> I also notice that when going through the shell in non-stop mode, it would be
> more correct to resume all threads --- we don't want non-stop and its
> scheduler-locking to apply to the shell.  Basically, non-stop should be off
> if there are pending execs.  This was an existing issue, and doesn't affect
> linux today, so I'll just ignore that for now, as it needs more tweaking to
> fix.