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

[Stefan Kangas]

Severity: minor

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.