cargo udeps doesn't work with opencv-rs with clang-runtime

[PPakalns]

Fails with the following error:

  error: Found argument 'build' which wasn't expected, or isn't valid in this context

  USAGE:
      cargo <SUBCOMMAND>

  For more information try --help

The command that cargo udeps can not process is run during build.rs in opencv-rs crate:
https://github.com/twistedfall/opencv-rust/blob/e9093f47b079f684de2c90be0f1adfbcd29447bc/build.rs#L266

let cargo_bin = PathBuf::from(env::var_os("CARGO").unwrap_or_else(|| "cargo".into()));
let mut cargo = Command::new(cargo_bin);
// generator script is quite slow in debug mode, so we force it to be built in release mode
cargo.args(&["build", "--release", "--package", "opencv-binding-generator", "--bin", "binding-generator"])
	.env("CARGO_TARGET_DIR", &*OUT_DIR);
if let Some(host_triple) = HOST_TRIPLE.as_ref() {
	cargo.args(&["--target", host_triple]);
}
println!("running: {:?}", &cargo);
Some(cargo.spawn()?)

Should this be fixed on opencv-rs side? What is the problem?

[est31]

This is basically the same problem as #97 is. The build script attempts to invoke cargo-udeps like it would invoke cargo, with a build command. cargo-udeps is unfamiliar with it though.