/usr/lib/x86_64-linux-gnu/libwebauth.so is in libwebauth-dev 4.5.5-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libwebauth.so.10.0.0
/usr/lib/x86_64-linux-gnu/libwebauth.so.10.0.0