Add OWNERS am: 57375dc9e2 am: cad02b136c am: 4f8ff5d670 am: 1c60e6194d am: c1c2887f59

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/structopt-derive/+/1356784

Change-Id: I30414da92aad465e1a3dc5e0aa336ab6a354e752