let abuild autodetect the coreboot path a bit better. So in the top level of
-rw-r--r-- 17987 COPYING
-rw-r--r-- 3346 NEWS
-rw-r--r-- 2562 README
drwxr-xr-x - documentation
drwxr-xr-x - payloads
drwxr-xr-x - src
drwxr-xr-x - targets
drwxr-xr-x - util