Merge "Invoke writeNinjaHint for only actual build" am: df9ae5c9 am: 26ece659 am: ea529d3b

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2579614



Change-Id: I3a14819057d8c2d82628a22c8cc21af60bd226ed
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>