/usr/share/doc/libh2o-dev-common/changelog.Debian.gz is in libh2o-dev-common 2.2.4+dfsg-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libh2o-dev-common/../libh2o0.13/changelog.Debian.gz