gnu: mpd: Add D-Bus dependency.
MPD requires D-Bus for Zeroconf support. Avahi is currently included as
a dependency, but Zeroconf isn't actually enabled due D-Bus. This also
enables udisks support.
Before this change, `mpd -V' returns:
Other features:
epoll icu inotify ipv6 systemd tcp un
After this change, `mpd -V' returns:
Other features:
avahi dbus udisks epoll icu inotify ipv6 systemd tcp un
* gnu/packages/mpd.scm (mpd): Add D-Bus dependency.
[inputs]: Add dbus.
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>