bug#57531: 28.1; Character encoding missing for "eo"

[Eli Zaretskii]

> From: Andreas Schwab <schwab@linux-m68k.org>
> Cc: Jonathan Reeve <jonathan@jonreeve.com>,  57531@debbugs.gnu.org
> Date: Sat, 03 Sep 2022 19:32:46 +0200
> 
> On Sep 03 2022, Eli Zaretskii wrote:
> 
> > Emacs cannot know the system character set unless the system tells
> > that.  The way to tell that is via the locale's codeset.
> 
> (locale-info 'codeset)

We already use that.