/usr/lib/x86_64-linux-gnu/libiio.so is in libiio-dev 0.7-1+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libiio.so.0
/usr/lib/x86_64-linux-gnu/libiio.so.0