[RFA] load lipthread symbols even when auto-solib-add is off

[Joel Brobecker]

> > 2006-10-17  Joel Brobecker  <brobecker@adacore.com>
> > 
> >         * solib.c (libpthread_solib_p): New function.
> >         (solib_add): Always read the symbols from the libpthread library.
> 
> Okay.

Thank you! Checked in.

-- 
Joel