/usr/lib/x86_64-linux-gnu/librasterlite.so is in librasterlite-dev 1.1g-4+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/librasterlite.so.2.0.0
/usr/lib/x86_64-linux-gnu/librasterlite.so.2.0.0