bug#21830: Useless messages from comint-previous-matching-input

[Eli Zaretskii]

> From: "John Wiegley" <jwiegley@gmail.com>
> Date: Wed, 04 Nov 2015 13:04:06 -0500
> Cc: 21830@debbugs.gnu.org
> 
> >>>>> Jay Adams <jka@google.com> writes:
> 
> > Can we please delete this line:
> > (message "History item: %d" (1+ pos))
> 
> Since there's no way to make use of that information, I wouldn't mind seeing
> it removed.

It was there since 1993.