Merge "Move aninja and overrideflags from shell functions to real scripts"...

Merge "Move aninja and overrideflags from shell functions to real scripts" into main am: 6e2d36da am: 3ee466f8

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/3087345



Change-Id: I559b322e7edf72524e484101ab4f66a98439fa09
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>