bug#29165: 26.0.90; can't use some code byte-compiled under emacs 24

[Noam Postavsky]

tags 29165 = patch
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Noam Postavsky <npostavs@users.sourceforge.net> writes:

> I've reverted my cl-lib code changes, so the conflict should be resolved
> now.  As for this bug, it seems the best way forward is to relax the
> checks so that an empty list of &optional variables is accepted.

Here's a patch.  Details of behaviour changes over versions are in the
commit message.

I probably should have got around to this before 26.0.91, but I think
this should still go to emacs-26 because the patch makes the behaviour
closer to what was in v25.

v1-0001-Allow-rest-or-optional-without-following-variable.patch
Description: patch