bug#28434: 25.2; Final "\ No newline at end of file" breaks Emacs patch handling.

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Tue, 25 Jun 2019 01:09:59 +0200
> Cc: 28434@debbugs.gnu.org, Oleksandr Gavenko <gavenkoa@gmail.com>
> 
> Noam Postavsky <npostavs@gmail.com> writes:
> 
> >> I think if you need this, you should add it to that variable, but I
> >> don't think this would be a good default.
> >
> > Hmm, the "\ No newline at end of file" thing is a de facto standard, so
> > shouldn't Emacs recognize it by default?
> 
> Hm...  is it?  I've always thought that was Emacs telling me I was doing
> something wrong.  :-)

It comes from Diff.

> But if that's the case, then perhaps we should add it?

Yes, I think so.