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