bug#55579: 29.0.50; Abbrevs not saved on exit anymore

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Date: Tue, 24 May 2022 21:42:58 +0300
> 
> > Save abbrevs in ~/.emacs.d/abbrev_defs?
> 
> BTW, I noticed that ~/.emacs.d/abbrev_defs
> is visited without font-locking.  Here's the fix:

Won't that make loading abbrevs slower and more expensive?  that file
is normally not edited interactively, only if the user explicitly
wants to do so.  So why is font-lock in it important?