Enable --help messages and accept --include-ignored as no-op (#703)

* Enable `--help` for CLI

Since clap 4, it requires the `help` feature to work.

* Accept `--include-ignored` for compatibility

This is a popular libtest parameter in CI to run all tests including
non-ignored and ignored ones. In our case, we have no "ignored"
semantics, thus it should be a no-op.

Cargo.toml

@@ -26,7 +26,7 @@ serde_json     = "1.0"
 serde_derive   = "1.0"
 ciborium       = "0.2.0"
 is-terminal    = "0.4.6"
-clap           = { version = "4", default-features = false, features = ["std"] }
+clap           = { version = "4", default-features = false, features = ["std", "help"] }
 walkdir        = "2.3"
 tinytemplate   = "1.1"
 cast           = "0.3"

src/lib.rs

@@ -906,6 +906,11 @@ impl<M: Measurement> Criterion<M> {
                 .num_args(0)
                 .hide(true)
                 .help("Ignored, but added for compatibility with libtest."))
+            .arg(Arg::new("include-ignored")
+                .long("include-ignored")
+                .num_args(0)
+                .hide(true)
+                .help("Ignored, but added for compatibility with libtest."))
             .arg(Arg::new("version")
                 .hide(true)
                 .short('V')