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

[Eli Zaretskii]

> Date: Wed, 18 Nov 2015 19:09:17 +0000
> From: Artur Malabarba <bruce.connor.am@gmail.com>
> Cc: 21953@debbugs.gnu.org
> 
> Quite a few of these are about using obsolete functions inside features that
> are themselves obsolete (their files are in the obsolete subdir). Maybe we can
> just suppress this kind of warning inside the obsolete subdir. Perhaps with a
> dir-local-variable? 

Sounds good to me.

If no one objects in a couple of days, please do that.