Revise ssl code to use a CERT_PKEY structure when outputting a

certificate chain instead of an X509 structure.

This makes it easier to enhance code in future and the chain
output functions have access to the CERT_PKEY structure being
used.

ssl/s3_clnt.c

@@ -3177,7 +3177,7 @@ int ssl3_send_client_certificate(SSL *s)
 		{
 		s->state=SSL3_ST_CW_CERT_D;
 		l=ssl3_output_cert_chain(s,
-			(s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
+			(s->s3->tmp.cert_req == 2)?NULL:s->cert->key);
 		s->init_num=(int)l;
 		s->init_off=0;
 		}