bsp-wide #defines

[gregory.menke at gsfc.nasa.gov]

Hi Joel,

I posted this here in case you check the list instead of your work
email.  I'm doing fairly well on the Racerxc bsp, its
configuring/makeing OK at this point.  I do find I need to #define a
couple things for the bsp that apply to source under libcpu.  I was
wondering if you prefer to put such things in bsp_specs or in the
CFLAGS supplied by the make/custom .cfg file.

Thanks,

Greg