pub unsafe extern "C" fn pw_conf_match_rules(
    str_: *const c_char,
    len: usize,
    location: *const c_char,
    props: *const spa_dict,
    callback: Option<unsafe extern "C" fn(data: *mut c_void, location: *const c_char, action: *const c_char, str_: *const c_char, len: usize) -> c_int>,
    data: *mut c_void
) -> c_int