bug#7786: 23.2; Encoding of PostScript files

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Wed, 13 Oct 2021 15:51:48 +0200
> Cc: 7786@debbugs.gnu.org
> 
> Emacs doesn't seem to have any support for ISOLatin1Encoding:
> 
> "In 1995, IBM assigned code page 1277 (CCSID 1277) to this character set."
> 
> Unless we have it under some other name.

I think you are right.  But we could create such an encoding, see
etc/charsets/ and the coding-system definitions to go with them.