bug#51733: 27.1; Detect impossible email addresses better

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: 51733@debbugs.gnu.org
> Date: Tue, 18 Jan 2022 13:00:42 +0100
> 
> OK, there's glyphless--bidi-control-characters, and I could make that
> non-private, and add the three missing ones...

I don't think that's what you want, because AFAIU that includes LRM,
RLM, and ALM, which are stateless.