/usr/lib/gcc-cross/arm-linux-gnueabi/4.7/libobjc.so is in libobjc-4.7-dev-armel-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-gnueabi/4.7/../../../../arm-linux-gnueabi/lib/libobjc.so.4