am 02c9813a: Prebuilt NDKs are merged for linux and darwin.

Merge commit '02c9813a726803e1c406b19f6b9dc4e411326e66' into gingerbread-plus-aosp

* commit '02c9813a726803e1c406b19f6b9dc4e411326e66':
  Prebuilt NDKs are merged for linux and darwin.