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

[Eli Zaretskii]

> Date: Sat, 30 Aug 2014 21:46:35 -0700
> From: Paul Eggert <eggert@cs.ucla.edu>
> CC: 18361@debbugs.gnu.org, dmantipov@yandex.ru
> 
> Eli Zaretskii wrote:
> > why are we importing the qsort_r module from gnulib
> 
> We're not.  Emacs is merely importing gnulib's stdlib module, which now 
> has placeholders (unused by Emacs) for qsort_r, just as it has 
> placeholders for all GNU functions it might define.

OK, thanks.  I guess what fooled me was this part of the commit
message:

  Sync from gnulib, incorporating:
  2014-08-29 qsort_r: new module, for GNU-style qsort_r