/usr/lib/x86_64-linux-gnu/libbroccoli.so is in libbroccoli-dev 1.97-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libbroccoli.so.5
/usr/lib/x86_64-linux-gnu/libbroccoli.so.5