Update build-tools to ab/6629626

Adds support for validations to ninja and ckati.

https://ci.android.com/builds/branches/aosp-build-tools-release/grid?head=6629626&tail=6629626

Test: treehugger
Change-Id: I92c46324b7c8836077b2ac5a94ff469c279744b2
39 files changed