Update build-tools to ab/3725807

Besides the compiler/libc++ update that caused everything to change, the
major update here is to ninja. Faster startup times due to less
reloading, and the ability to use the depslog when writing multiple
output files.

Bug: 32749731
Test: m -j
Change-Id: I84cac9aac12d24f70b0dd163d67cb71a1b31c09b
27 files changed
tree: 84a2f2d8702f4f48c066dd35ac09720109add26a
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml