buildroot

Add Gnublin board support with fixed kernel header version

[Peter: misc white space fixup]
Signed-off-by: Zoltan Gyarmati <mr.zoltan.gyarmati@gmail.com>
Acked-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>