bug#81517: 31.0.90; executable-find on remote buffer fails

> From: Michael Albinus <[email protected]>
> Cc: Shun-ichi TAHARA <[email protected]>,  [email protected]
> Date: Thu, 30 Jul 2026 09:01:39 +0200
> 
> Eli Zaretskii <[email protected]> writes:
> 
> Hi Eli,
> 
> >> If this commit is merged to Emacs31, many Windows users are happy.
> >
> > I imagine those users to be less happy if that commit, which is far
> > from trivial, causes regressions elsewhere.
> >
> > Being very close to a release, this is not a simple obvious decision
> > to make, it involves risks that need to be assessed.  By contrast, the
> > offending commit was with us for more than a year, with no complaints
> > from the users of what is now the Emacs 31 pretest.
> 
> As a compromise, we might backport only the fix in executable-find (a
> one-liner), and backport the other changes to Emacs 31.2. It looks
> simple enough (I know, famous last words ...).

I don't think it's a good idea to have executable-find behave
differently from call-process etc.  No, if we backport, we should
backport all of it, IMO.  Let's wait for Sean to chime in.