More rm -rf to rm -f changes.
More rm -rf to rm -f changes.

- bom/Makefile (atusd.ord, atusd.par): rm -r in case of failure is enough
  (reported by Wolfgang Spraul)

cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan