/usr/lib/x86_64-linux-gnu/libselinux.so is in libselinux1-dev 2.4-3build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /lib/x86_64-linux-gnu/libselinux.so.1
/lib/x86_64-linux-gnu/libselinux.so.1