/usr/powerpc64-linux-gnu/lib32/libcidn.so is in libc6-dev-powerpc-ppc64-cross 2.23-0ubuntu3cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/powerpc64-linux-gnu/lib32/libcidn.so.1
/usr/powerpc64-linux-gnu/lib32/libcidn.so.1