/usr/lib/libITKPolynomials-4.6.so is in libinsighttoolkit4-dev 4.6.0-3+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libITKPolynomials-4.6.so.1
/usr/lib/libITKPolynomials-4.6.so.1