Replace env!("...") expressions am: a7d348ca4e am: bb928e8543 am: edaecc6a82 am: 41067ee4c3

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/structopt/+/1485261

Change-Id: I983d94a1e270510105b287b2f29f17bd7aa55751