[contacts] Properly specify build dependencies.

DON'T block multicore builds.
[contactsd] QtGui is no longer required. Remove it.
Merge pull request #36 from rburchell/master

Build system cleanup.
Merge pull request #35 from matthewvogt/voicemail-contact

[contactsd] Add voicemail contact if configured
Move translation handling to main

The telepathy plugin is loaded too late, and these translations are
shared by several plugins.
Add engineering text for Birthday calendar name
Set ofono modem path for messageWaiting