/usr/lib/gcc-cross/mipsel-linux-gnu/8/n32/libgomp.so is in libn32gcc-8-dev-mipsel-cross 8-20180414-1ubuntu2cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gcc-cross/mipsel-linux-gnu/8/n32/../../../../../mipsel-linux-gnu/lib32/libgomp.so.1