Update build-tools to ab/3725807 am: f08dad472e am: ef321317dd
am: 3bce954271

Change-Id: I616637b2ac1d4c1384b8e60ec8c5291988167d7a
tree: 84a2f2d8702f4f48c066dd35ac09720109add26a
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml