/usr/share/doc/gdc-4.8-aarch64-linux-gnu/changelog.Debian.gz is in gdc-4.8-aarch64-linux-gnu 4.8.2-13ubuntu1cross0.11.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gdc-4.8-aarch64-linux-gnu/../gcc-4.8-aarch64-linux-gnu-base/changelog.Debian.gz