bug#55386: 29.0.50; check-declare-directory doesn't work on Windows

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: 55386@debbugs.gnu.org, Eli Zaretskii <eliz@gnu.org>
> Date: Fri, 13 May 2022 14:25:10 +0200
> 
> There does seem to be an issue in `check-declare-directory' in Emacs
> under Windows, though -- find is complaining about syntax errors in the
> "find" command we're constructing.
> 
> Eli, does `check-declare-directory' work for you on some Lisp directory
> on Windows?

Yes, it does.

Yasuhiro Kimura, can you tell where you got your ports of Find and
Grep?