Use a better property to find the ABI in the fallback. am: b814b5eca0 am: 72c5cd630f am: 69bb52b0b2 am: 0859743a8f am: 6f6e8509a7

Original change: https://android-review.googlesource.com/c/platform/art/+/2208695

Change-Id: Ied06e6eab7be112113881e37ca56491d3c5145eb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>