[m-rev.] diff: warn about unknown format strings

[Zoltan Somogyi]

On Wed, 28 Jan 2015 17:14:38 +1100 (AEDT), Julien Fischer <jfischer at opturion.com> wrote:
> > I don't want to commit this until everyone has installed the change
> > to track format strings through appends (committed thursday,
> > IIRC), so can people please tell me whether they have done
> > an install since then?
> 
> It's available in rotd-2015-01-28, so you can go ahead and commit
> this change.

Done.

Zoltan.