Update TEST_MAPPING am: fa4b6b3a8a am: ddd1d95b72 am: 912265b845 am: 74a8719bc5

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

Change-Id: Iee7a3fe0343565af39bf9022d5e5ffdbade7b1fb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>