bug#31737: 26.1.50; Gnus does not use mailutils movemail

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Cc: Eli Zaretskii <eliz@gnu.org>,  Colin Baxter <m43cap@yandex.com>,  
> 31737@debbugs.gnu.org
> Date: Wed, 13 Jun 2018 16:08:53 +0200
> 
> Eli, were you thinking that mail-source should duplicate the movemail
> detection logic in rmail? Or should it just assume Mailutils movemail
> and pass '--emacs'?

The former.