am 89a2450a: Merge "Remove makefile cruft."

* commit '89a2450a407ef237e5e35fb21a682758cc6b5f5a':
  Remove makefile cruft.
tree: 7110188cb2b8c6a74c0dd6cb3cf1a23bab0f85fd
  1. audio_effects/
  2. audio_route/
  3. audio_utils/
  4. camera/
  5. private/
  6. CleanSpec.mk