pub unsafe extern "C" fn weld_conf_free(conf: weld_conf_t) {
    let conf = conf as *mut weld::WeldConf;
    if !conf.is_null() {
        Box::from_raw(conf);
    }
}
Free a configuration.

The passsed configuration should have been allocated using `weld_conf_new`.
weld-capi/src/lib.rs