chore: use pre-existing clean APIs instead

    // account for compile differences and such.

    println!("cargo:rerun-if-changed=build/expando.c");

    let mut gcc = cc::Build::new();

    for include_dir in include_dirs {

        gcc.include(include_dir);

    }

    gcc.includes(include_dirs);

    let expanded = match gcc.file("build/expando.c").try_expand() {

        Ok(expanded) => expanded,

        Err(e) => {

}

// parses a string that looks like "0x100020cfL"

#[allow(deprecated)] // trim_right_matches is now trim_end_matches

#[allow(clippy::match_like_matches_macro)] // matches macro requires rust 1.42.0

fn parse_version(version: &str) -> u64 {

    // cut off the 0x prefix

    assert!(version.starts_with("0x"));

    let version = &version[2..];

    // and the type specifier suffix

    let version = version.trim_right_matches(|c: char| match c {

        '0'..='9' | 'a'..='f' | 'A'..='F' => false,

        _ => true,

    });

    let version = version.trim_end_matches(|c: char| !c.is_ascii_hexdigit());

    u64::from_str_radix(version, 16).unwrap()

}