Fix structopt-derive/METADATA am: 7a5d9b3390 am: f7af03948a am: 51e0ea6cd3 am: c3da38a393

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/structopt-derive/+/1414006

Change-Id: I013779c0d96717b73d7bf47ff9a9a3eb19b0d2e5