[LinuxBIOS] OLPC buildsystem cleanups

[Richard Smith]

> I wouldn't have any problem redirecting the payload somewhere within the
> LinuxBIOS build, assuming the LinuxBIOS owners are cool with that paradigm.
>

Speaking as one  I don't have an issue.

In fact thats normally how I setup my config files anyway.  Most
LinuxBIOS payloads are build outside of LB.  I usually copy them into
my target directory with my config files so that if I need to blow
away my build dir and start over clean I can without nuking my
payload(s).

-- 
Richard A. Smith