bug#7626: 23.2.91; Rmail shows incorrect message encoding in the mode line

[Eli Zaretskii]

> From: Kenichi Handa <handa@m17n.org>
> Cc: 7626@debbugs.gnu.org
> Date: Mon, 17 Jan 2011 10:22:35 +0900
> 
> Rmail-mime does not perform file I/O, but decodes a text
> that is already stored in a mbox buffer.

But the mbox format uses Unix EOLs.  In fact, Rmail will barf if you
say "C-u g FILE RET", and FILE has DOS EOLs.  So the EOL format is
known in advance in this case.