/usr/lib/x86_64-linux-gnu/libicuio.so is in libicu-dev 4.8.1.1-12+deb7u3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libicuio.so.48.1.1
/usr/lib/x86_64-linux-gnu/libicuio.so.48.1.1