/usr/lib/x86_64-linux-gnu/libxenlight.so is in libxen-dev 4.4.1-9+deb8u10.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libxenlight-4.4.so
/usr/lib/x86_64-linux-gnu/libxenlight-4.4.so