/usr/lib/gcc-cross/mips-linux-gnu/5/n32/libgomp.so is in libn32gcc-5-dev-mips-cross 5.3.1-14ubuntu2cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gcc-cross/mips-linux-gnu/5/n32/../../../../../mips-linux-gnu/lib32/libgomp.so.1