Update build-tools to ab/4645397

All the Go programs switched from compiling with Go1.9 to Go1.10.

Add the xz tool.

Bug: 36130900
Test: m
Change-Id: Ifd12cdba8a50c8b3a9f38751e3548acc630d4e21
38 files changed
tree: fb5a8e6563b480c37b729f4bafe0e496eeaf1f78
  1. common/
  2. darwin-x86/
  3. linux-x86/
  4. build-prebuilts.sh
  5. manifest.xml
  6. OWNERS