bug#58506: Use ".dir-locals.eld" and ".dir-locals-2.eld" when they exist

[Robert Pluim]

>>>>> On Fri, 14 Oct 2022 15:10:04 +0200, Lars Ingebrigtsen <larsi@gnus.org> 
>>>>> said:

    Lars> Robert Pluim <rpluim@gmail.com> writes:
    >> Seriously, having files popping up safe-variable warnings is scary
    >> enough already, do we really need to complicate things by adding
    >> yet-another not-quite-lisp syntax? Is the support for `eval' in
    >> .dir-locals.el not enough?

    Lars> It's not -- there's a bunch of bug reports around these issues
    Lars> *handwaves at debbugs*.

My debbugs-gnu-foo must be too weak: I can only find two, neither of
which look like theyʼd be fixed by changing the syntax accepted by
.dir-locals.el

Robert
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