Replace env!("...") expressions am: a7d348ca4e

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

Change-Id: I45f75932ffb007d8daa801affc42285d22ffeeb6
diff --git a/examples/gen_completions.rs b/examples/gen_completions.rs
index 4f35b07..6dbd97f 100755
--- a/examples/gen_completions.rs
+++ b/examples/gen_completions.rs
@@ -19,7 +19,7 @@
 
 fn main() {
     // generate `bash` completions in "target" directory
-    Opt::clap().gen_completions(env!("CARGO_PKG_NAME"), Shell::Bash, "target");
+    Opt::clap().gen_completions("structopt", Shell::Bash, "target");
 
     let opt = Opt::from_args();
     println!("{:?}", opt);