Fix race condition with X509Name creation

    /// Return an `X509Name`.

    pub fn build(self) -> X509Name {

        self.0

        // Round-trip through bytes because OpenSSL is not const correct and

        // names in a "modified" state compute various things lazily. This can

        // lead to data-races because OpenSSL doesn't have locks or anything.

        X509Name::from_der(&self.0.to_der().unwrap()).unwrap()

    }

}