Build the support libraries for the GdbARMPlugin in the 32-bit Mac OS build.

Download binutils from http://ftp.gnu.org/gnu/binutils/binutils-2.25.tar.gz
Unpack binutils-2.25.tar.gz to binutils-2.25
Unpack ../ARM-gdb-7.6.zip to gdb-7.6

./BUILD.sh
