bug#57129: 29.0.50; Improve behavior of conditionals in Eshell

[Eli Zaretskii <eliz@gnu.org>]

> Date: Tue, 16 Aug 2022 12:11:24 -0700
> Cc: bruno@clisp.org, bug-gnulib@gnu.org, larsi@gnus.org,
>  57129@debbugs.gnu.org, jporterbugs@gmail.com
> From: Paul Eggert <eggert@cs.ucla.edu>
> 
> > Thanks, but why not use 'random' instead?  Emacs does have it on all
> > platforms, including MS-Windows.  AFAIU, it's better than 'rand'.
> 
> If the code used 'random' then the Gnulib 'tempname' module would need 
> to add a dependency on the Gnulib 'random' module, which would in turn 
> add a cascading dependency on Gnulib's 'random_r' module. It's better to 
> avoid this dependency if we can easily do so.
> 
> Come to think of it, we don't need to use 'rand' either, since 
> tempname.c already has a good-enough pseudorandom generator. I installed 
> into Gnulib the attached patch, which I hope fixes the Emacs problem 
> without changing glibc's generated code (once this gets migrated back 
> into glibc).

Thanks.

Would it be possible to cherry-pick this to the emacs-28 branch, so
that Emacs 28.2 would have this fixed?