/usr/x86_64-linux-gnux32/lib/libmvec.so is in libc6-dev-x32-cross 2.27-3ubuntu1cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/x86_64-linux-gnux32/lib/libmvec.so.1
/usr/x86_64-linux-gnux32/lib/libmvec.so.1