Update TEST_MAPPING am: fa4b6b3a8a am: ddd1d95b72 am: 912265b845

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/structopt-derive/+/2108609

Change-Id: Id8142a4df592fa969780026991b3c4e05db490d3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>