/usr/share/doc/mir-platform-graphics-android12/changelog.Debian.gz is in mir-platform-graphics-android12 0.26.3+16.04.20170605-0ubuntu1.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/mir-platform-graphics-android12/../libmircore1/changelog.Debian.gz