bug#28639: 26.0.60; get-free-disk-space gives wrong number on OS X 10.8 and later

[Eli Zaretskii]

> From: Michael Albinus <michael.albinus@gmx.de>
> Date: Mon, 02 Oct 2017 18:11:08 +0200
> Cc: 28639@debbugs.gnu.org
> 
> One point: I will commit changes in lisp/files.el and src/fileio.c to
> the master branch. The changes in Tramp will go to the emacs-26 branch,
> because the Tramp version in Emacs 26, 2.3.3, is not released yet, and I
> don't want to start with the next release 2.3.4 now. This shouldn't be a
> problem, because nobody will call Tramp file name handlers for
> `file-system-info' in Emacs 26.

That'd be okay, I think.