bug#57152: 29.0.50; Emacs executable isn't rebuilt when loaddefs.el is modified

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: 57152@debbugs.gnu.org
> Date: Fri, 12 Aug 2022 17:14:26 +0200
> 
> Anyway, back to the problem -- I've poked at this quite a bit, but no
> solutions seem really...  nice?  If we updated the loaddefs.el file a
> bit earlier (before we build the Emacs executable), that'd fix the
> problem, but I could find a way to do that without breaking something
> else.  There's probably something trivial I'm overlooking here.

Something similar to what we do with $(shortlisp), perhaps?