Update build-tools to ab/3638574 am: e465fa7f55 am: dbcd61a118
am: 6b675f9064

Change-Id: I78e2c6be6b6d409f588511c9037bbf571bc77880
tree: c328723e5534f8149f709229d5b2fe00fcab21d3
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml