bug#64735: 29.0.92; find invocations are ~15x slower because of ignores

[Eli Zaretskii]

> Cc: Spencer Baugh <sbaugh@janestreet.com>, 64735@debbugs.gnu.org
> From: Ihor Radchenko <yantar92@posteo.net>
> Date: Thu, 20 Jul 2023 15:42:17 +0000
> 
> I am pretty sure that Emacs's native file routines can be optimized to
> the level of find.

Maybe it can be improved, but not to the same level as Find, because
consing Lisp strings, something that Find doesn't do, does have its
overhead.