Link to D-Bus only when needed.
Link to D-Bus only when needed.

Change-Id: I799ca372398597e640a4d5a0f7e48c1568eb7079
Reviewed-on: http://codereview.qt.nokia.com/3062
Reviewed-by: Qt Sanity Bot <5581206bb7e0307f0d99eb71898ae6b694149ca5@ovi.com>
Reviewed-by: Xizhi Zhu <6095b3dbb866d5a6b4a607e0cbd4aaa65e13c0b2@nokia.com>

qtproject/qtsystems,qtproject/qtsystems