message: Add test to check that --pkg-config conflicts with other flags
diff: @@ -3,6 +3,32 @@ use std::path::{Path, PathBuf};
  use std::process::Command;
  use wasmer_integration_tests_cli::get_wasmer_path;
  +#[test]
  +fn wasmer_config_error() -> anyhow::Result<()> {
  + let output = Command::new(get_wasmer_path())
  + .arg("config")
  + .arg("--bindir")
  + .arg("--cflags")
  + .arg("--pkg-config")
  + .output()?;
  +
  + let lines = String::from_utf8_lossy(&output.stderr)
  + .lines()
  + .map(|s| s.trim().to_string())
  + .collect::<Vec<_>>();
  + let expected = vec![
  + "error: The argument '--bindir' cannot be used with '--pkg-config'",
  + "",
  + "USAGE:",
  + "wasmer config --bindir --cflags",
  + "",
  + "For more information try --help",
  + ];
  +
  + assert_eq!(lines, expected);
  +
  + Ok(())
  +}
  #[test]
  fn config_works() -> anyhow::Result<()> {
  let bindir = Command::new(get_wasmer_path())
  