bug#45795: 27.1; prolog-mode prolog-system switch bug

[Lars Ingebrigtsen]

k3tu0isui@gmail.com writes:

> I have repeatedly checked switching between GNU-Prolog and SWI-Prolog
> systems after setting `prolog-system` to buffer local values 'gnu' and
> 'swi' resp.
> Both `prolog-consult-file` and `run-prolog` are now starting the
> correct interpreter.

I don't use Prolog myself, but your patch seems to make sense to me, so
I've applied it to Emacs 28.

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   bloggy blog: http://lars.ingebrigtsen.no