bug#57041: [PATCH] Add a word about warnings to CONTRIBUTE

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Stefan Kangas <stefan@marxist.se>,  57041@debbugs.gnu.org
> Date: Sun, 07 Aug 2022 17:05:09 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > But I see no particular reasons to describe exceptions.
> 
> This does seem useful to state explicitly:
> 
> + we don't
> +usually care about warnings from ancient or buggy compilers, but we do
> +try to pacify warnings from stable versions of GCC.
> 
> Because it has happened that people have submitted patches to pacify
> ancient gcc versions, and that's not useful work.

Why do we have to say this in CONTRIBUTE, though?  It's already too
long; making it longer will just increase the probability of TL;DR,
and no one's the wiser.