bug#48079: Temporary files while building after native-comp merge

[Eli Zaretskii <eliz@gnu.org>]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Wed, 28 Apr 2021 06:10:06 -0500
> Cc: Andrea Corallo <akrl@sdf.org>
> 
> After the native-comp merge, I see temporary files like this while
> building:
> 
>     lisp/emacs-lisp/cl-generic.elcsEFkYM
>     lisp/emacs-lisp/lisp-mode.elcghtoKr
>     lisp/emacs-lisp/macroexp.elco2VM6n
>     lisp/emacs-lisp/nadvice.elcCtU6Tw
>     lisp/emacs-lisp/syntax.elcM42AoI
>     lisp/emacs-lisp/tabulated-list.elc0hWK4o
> 
> These files show up in "git status" (in my case, more specifically, in
> my `magit-status' buffer) if you run that command at the wrong time.
> 
> It would be nice if these files could be added to .gitignore or
> something so that one doesn't have to see them, even briefly.

This is due to some bug, so ignoring these files would not be TRT.
I have no such files, FWIW.

Can you tell by looking at the times of these files when they were
created? is that during your bootstrap following the merge of the
branch?  Is it possible some native-compilation crashed at some point
(in which case these files could be left behind)?