alarm/xbmc-rbp, alarm/xbmc-rbp remove libnfs patches

Those packages should not need the libnfs fix anymore (see #923 and #917).
I have not tried to build them, but I can see no reason why they shouldn't. alarm/xbmc-imx works just fine without the patch.

I did not touch community/xbmc as the upstream package has not removed the patch yet.

@moonman should probably approve of this change.

Cheers