Update build-tools to ab/5603989

https://ci.android.com/builds/branches/aosp-build-tools/grid?head=5603989&tail=5603989

This has a lot of updates, but in particular, it brings in a ninja merge
from upstream, which switches to 64-bit timestamps, among other changes.

Test: treehugger
Change-Id: I68906f2ca3307920674a68569d080088689760d8
78 files changed
tree: df1ed696d6ee9a596c39c0e6c6cbc49da5a71987
  1. common/
  2. darwin-x86/
  3. linux-x86/
  4. path/
  5. build-prebuilts.sh
  6. manifest.xml
  7. OWNERS