/usr/mips64el-linux-gnuabi64/lib/libgnatvsn.so is in libgnatvsn6-dev-mips64el-cross 6.4.0-17ubuntu1cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/mips64el-linux-gnuabi64/lib/libgnatvsn.so.6