/usr/x86_64-linux-gnu/lib32/libgdruntime.so.76 is in lib32gphobos76-amd64-cross 8-20180414-1ubuntu2cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/x86_64-linux-gnu/lib32/libgdruntime.so.76.0.2