[liburcu] Update to version 0.7.7
[mesa-mir] Update to version 9.1.6 with Ubuntu release 2ubuntu2
[xorg-server-mir] Update to version 1.14.2.901 with Ubuntu release 2ubuntu1
[xf86-video-intel-mir] Update to version 2.21.14 with Ubuntu release 4ubuntu2
Merge branch 'master' into tracker-mir-bzr