bug#25074: Very fast battery status function using upowerd

[Eli Zaretskii]

> From: Evgeny Zajcev <lg.zevlg@gmail.com>
> Date: Wed, 30 Nov 2016 14:53:16 +0300
> 
> Hello, here is very fast dbus based battery status function, implemented
> using upower interface. Could you please include it in battery.el ?
> 
> https://github.com/zevlg/emacs/commit/fdd371ca88e55895b1cf8b93165b6680dd1ec9f0

Thanks, but could you please include the patch with your message
posted here?  "git format-patch" is fine.  That would make applying
the patch easier.