get_build_var and get_abs_build_var are now scripts am: 5a62e765

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/3101802



Change-Id: I3eb083309f0327a0d73cfe849b5a8e29763964f0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>