message: fix(build): rustc check works now
diff: use emoji;
  use error::Error;
  use progressbar::Step;
  -use std::env;
  use std::path::Path;
  use std::process::Command;
  use std::str;
  @@ -44,8 +43,7 @@ fn rustc_minor_version() -> Option<u32> {
  }
  };
  }
  - let rustc = otry!(env::var_os("RUSTC").unwrap_or(|| "rustc".into())); // updated because we are not in a build script
  - let output = otry!(Command::new(rustc).arg("--version").output().ok());
  + let output = otry!(Command::new("rustc").arg("--version").output().ok());
  let version = otry!(str::from_utf8(&output.stdout).ok());
  let mut pieces = version.split('.');
  if pieces.next() != Some("rustc 1") {
  