/usr/lib/x86_64-linux-gnu/libspiro.so is in libspiro-dev 1:0.5.20150702-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libspiro.so.0.0.5
/usr/lib/x86_64-linux-gnu/libspiro.so.0.0.5