/usr/lib/x86_64-linux-gnu/libgringotts.so is in libgringotts-dev 1:1.2.1-16.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgringotts.so.2.0.7
/usr/lib/x86_64-linux-gnu/libgringotts.so.2.0.7