Update build-tools to ab/4288972.
am: 9c1d65b391

Change-Id: Id08b36f67d51218d1dafe502c0d7963806c020c8
tree: 50bc7ccebbba6a04230aa0311a0a3f3a22f743ad
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml
  5. OWNERS