bug#31318: emacs-26 fns-tests-collate-sort failure on glibc 2.27

[Eli Zaretskii]

> Cc: 31318@debbugs.gnu.org
> From: Paul Eggert <eggert@cs.ucla.edu>
> Date: Tue, 1 May 2018 09:31:30 -0700
> 
> On 05/01/2018 09:11 AM, Eli Zaretskii wrote:
> > how about replacing
> > these tests with something that works in a non-en_US locale in a way
> > that is different from en_US?
> 
> Something along those lines could be done (it's done in coreutils with 
> French), but it's a bit tricky so presumably it should be done in 
> master. In contrast the patch I'm proposing is designed for emacs-26.

I'm okay with applying your patch to emacs-26 and then re-adding tests
on master.

Thanks.