/usr/lib/gcc-cross/powerpc-linux-gnu/4.8/libmudflapth.so is in libmudflap0-4.8-dev-powerpc-cross 4.8.1-10ubuntu7cross0.9.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gcc-cross/powerpc-linux-gnu/4.8/../../../../powerpc-linux-gnu/lib/libmudflapth.so.0