[PATCH] Use setq-local compatible with Emacs 26

[Radon Rosborough]

Hello all,

I noticed that commit e625dc05 of 2022-02-24 made AUCTeX incompatible
with Emacs 26 by using the variadic form of setq-local that was
introduced in Emacs commit 88f0c566 of 2019-10-11 and first released
in Emacs 27.1. The current version of AUCTeX still lists Emacs 25.1 as
the minimum compatible version (based on file auctex.el.in from commit
aae80c47 of 2022-04-14), so I am guessing this was unintentional.
Anyway, it triggers a byte-compilation error in my configuration, so I
have attached a patch to fix the issue.

I have never contributed to a Savannah project before, so please let
me know if the formatting needs to be adjusted, or if I need to submit
elsewhere.

Thanks,
Radon Rosborough

0001-Avoid-using-variadic-setq-local.patch
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