[contactsd] Add voicemail contact if configured

If a number has been configured as the voicemail access number, either
manually or by the system, create a contact to represent that number.
[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
Merge pull request #37 from special/voicemail-fixup

Improve voicemail number detection from ofono and translations
[service] Add -o to invoker exec cmd
Merge pull request #38 from faenil/oom

[service] Add -o to invoker exec cmd
[contactsd] Fix crash in voicemail contact update

The voicemailConfigurationChanged signal could arrive via ofono before
sim presence is online and updateVoicemailConfiguration is called, which
would result in the use of a null pointer to the MGConfItem.
Merge pull request #39 from special/voicemail-crash

[contactsd] Fix crash in voicemail contact update