/usr/lib/gcc-cross/arm-linux-gnueabihf/4.7/libgcc_s.so.1 is in libgcc-4.7-dev-armhf-cross 4.7.4-3ubuntu12cross3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gcc-cross/arm-linux-gnueabihf/4.7/../../../../arm-linux-gnueabihf/lib/libgcc_s.so.1