Update build-tools to ab/6978702 am: 282bf24c0b am: 80883f1424 am: 1b6aff6d1c

Original change: https://android-review.googlesource.com/c/platform/prebuilts/build-tools/+/1502271

Change-Id: Id71ae056583e14f2de2b68769cab2feb2f63aeb6