Missing osdependency to PkgConfig in common/graphics/osg_text

[mmaurus]

Error occurs on docker-transfit-mmi, Ubuntu 16.04:
http://bob.dfki.uni-bremen.de:8080/job/docker-transfit-mmi/DOCKERFILE=16.04/268/display/redirect

[malter]

Looks like there is another problem:

autoproj: failed in osdeps phase
see /opt/rock/install/log/autoproj-osdeps.log for details