am a7a60a82: add use-art, use-artd, use-dalvik phony targets

* commit 'a7a60a8244dd6f6e70ff1d7babf261c7a8da873a':
  add use-art, use-artd, use-dalvik phony targets
tree: a8009b0d6acd847ce1ac71c11e6c2967951a67fe
  1. build/
  2. dalvikvm/
  3. jdwpspy/
  4. src/
  5. test/
  6. tools/
  7. .gitignore
  8. Android.mk