/usr/x86_64-linux-gnu/libx32/libnsl.so is in libc6-dev-x32-amd64-cross 2.27-3ubuntu1cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/x86_64-linux-gnu/libx32/libnsl.so.1
/usr/x86_64-linux-gnu/libx32/libnsl.so.1