bug#33796: 27.0.50; Use utf-8 is all our Elisp files

[Stefan Monnier]

> PPS. How about also converting etc/tutorials/TUTORIAL.ja,
> lisp/leim/quail/hanja-jis.el, lisp/leim/quail/japanese.el,
> lisp/leim/quail/py-punct.el, and lisp/leim/quail/pypunct-b5.el?

I don't see how we'll ever get rid of support for iso-2022 encoding, so
I'm not terribly concerned about converting files like TUTORIAL.ja.
If you think it's a good idea, of course, I'm very much in favor of such
a change, but I focused on .el files because I'm interested in
standardizing Elisp files to utf-8 and get rid of
load-with-code-conversion (a distant target, admittedly, but at least
I can see a path that can get us there).

I missed the above 4 Elisp files because my regexp fu was too weak.
I'll update my patch, thanks,


        Stefan