/usr/lib/bacula/libbacsql.so is in bacula-common-mysql 7.0.5+dfsg-4build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/bacula/libbacsql-7.0.5.so
/usr/lib/bacula/libbacsql-7.0.5.so