[RFA]: test suite: recognize GDB message for unsupported threads

[Jim Blandy]

Michael Snyder <msnyder@cygnus.com> writes:
> Jim Blandy wrote:
> > Without this change, the test suite hangs on Linux systems that have
> > real-time signals, but lack libthread-db.
> 
> Cool.  As the new but not yet announced co-maintainer for gdb thread
> testsuites, I approve.  Please check it in.

Thanks.  I've committed this.