bug#18361: New 'sort' implementation can crash Emacs

[Eli Zaretskii]

> Date: Sat, 30 Aug 2014 16:05:03 -0700
> From: Paul Eggert <eggert@cs.ucla.edu>
> Cc: Dmitry Antipov <dmantipov@yandex.ru>
> 
> I installed what I hope is a fix for this bug as trunk bzr 117784; 
> please give it a look.

Thanks.

There's something I don't understand in that changeset: why are we
importing the qsort_r module from gnulib, but then don't use anywhere?
What am I missing?