/usr/powerpc-linux-gnuspe/lib/libgnat-8.so is in gnat-8-powerpc-linux-gnuspe 8-20180414-1ubuntu2cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/powerpc-linux-gnuspe/lib/libgnat-8.so.1
/usr/powerpc-linux-gnuspe/lib/libgnat-8.so.1