Update build-tools to ab/4629474
am: ec4e9f97f5

Change-Id: I87c25a4aaa7551774444a2fbed00fea7a507b993
tree: f4d60a56b64ae1d37a778dea377c508c8d80ee2c
  1. common/
  2. darwin-x86/
  3. linux-x86/
  4. build-prebuilts.sh
  5. manifest.xml
  6. OWNERS