am b86b7f72: Re-organize the SDK, moving the build tools out of the platforms.

Merge commit 'b86b7f72db1549cb526a141ca8b6158908483f1a' into gingerbread-plus-aosp

* commit 'b86b7f72db1549cb526a141ca8b6158908483f1a':
  Re-organize the SDK, moving the build tools out of the platforms.