bug#21953: Eliminate warnings in the emacs-25 release branch

[Eli Zaretskii]

> From: Andreas Röhler <andreas.roehler@easy-emacs.de>
> Date: Thu, 26 Nov 2015 09:33:05 +0100
> Cc: John Wiegley <jwiegley@gmail.com>
> 
> As any change might create a new bug, IMO it's better to tackle this not 
> shortly before, rather after a release.

Experience shows that things deferred toll "after the release" tend to
remain unhandled.

We still have a lot of time before the release, and didn't get
anywhere close to a stable codebase, so there's nothing wrong in
trying to fix some of the warnings now.

TIA