bug#63236: 29.0.90; loaddefs-generate not 100% backwards compatible

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Cc: 63236@debbugs.gnu.org
> Date: Thu, 04 May 2023 10:45:37 +0200
> 
>     >> Looking at the history, the autoloads generation was rewritten for
>     >> emacs-29, so this looks like a minor regression.
> 
>     Eli> Yes, loaddefs-gen.el is new, so we must fix it on the emacs-29 
> branch.
> 
> Then the easiest fix would be to search for two ';' instead of three.

OK, let's do that, and thanks.