bug#52105: comp-tests.el causes byte-compiler warnings

[Eli Zaretskii]

> From: Andrea Corallo <akrl@sdf.org>
> Date: Thu, 25 Nov 2021 16:58:51 +0000
> Cc: 52105@debbugs.gnu.org
> 
> > The following small patch eliminates all the compile-time warnings
> > from comp-tests.el.
> >
> > This patch is against the master branch, but since the patch changes only
> > test/, perhaps you would like me to re-work it for the emacs-28 branch.
> 
> Hi Stephen,
> 
> thanks for the patch, LGTM.
> 
> For the emacs-28 subject I let Eli or Lars speak.

I see no reason to install this on the release branch.  Master is
good enough, IMO.