Bug#1023850: do not require dbus, use default-dbus-system-bus | dbus-system-bus

[Dominick Grift <dominick.grift@defensec.nl>]

Package: rtkit
Version: 0.13-4+b1

rtkit currently depends on package dbus. This package pulls in package
dbus-daemon.

this behavior is not desired on systems that use package dbus-broker
instead of package dbus-daemon.

see package policykit-1 for an example of how to depend on either
dbus-daemon or dbus-broker depending on what is used.

-- 
gpg --locate-keys dominick.grift@defensec.nl
Key fingerprint = FCD2 3660 5D6B 9D27 7FC6  E0FF DA7E 521F 10F6 4098
Dominick Grift