Provide an option for the base/rom extension that causes the toolchain id (ARMCC or GCCE) to be defined for the C preprocessor phase of rombuild, enabling rom files to be conditionally included or excluded depending on whether the toolchain can build them. This mimics the same change for Beagleboard.

#!/usr/bin/env python
from lib2to3.main import main
import sys
import os

sys.exit(main("lib2to3.fixes"))