Don't send a for ServerKeyExchange for kDHr and kDHd

The certificate already contains the DH parameters in that case.
ssl3_send_server_key_exchange() would fail in that case anyway.
Reviewed-by: NMatt Caswell <matt@openssl.org>

ssl/d1_srvr.c

@@ -484,7 +484,7 @@ int dtls1_accept(SSL *s)
 #ifndef OPENSSL_NO_PSK
                 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 #endif
-                || (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd))
+                || (alg_k & SSL_kDHE)
                 || (alg_k & SSL_kECDHE)
                 || ((alg_k & SSL_kRSA)
                     && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL