Don't change client random in Client Hello in its second flight

Reviewed-by: NBen Kaduk <kaduk@mit.edu>
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4490)

ssl/statem/statem_clnt.c

@@ -1035,8 +1035,9 @@ int tls_construct_client_hello(SSL *s, WPACKET *pkt)
                 break;
             }
         }
-    } else
-        i = 1;
+    } else {
+        i = s->hello_retry_request == 0;
+    }
 
     if (i && ssl_fill_hello_random(s, 0, p, sizeof(s->s3->client_random),
                                    DOWNGRADE_NONE) <= 0)