Only send custom extensions where we have received one in the ClientHello

We already did this for ServerHello and EncryptedExtensions. We should be
doing it for Certificate and HelloRetryRequest as well.
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3298)

ssl/statem/extensions_cust.c

@@ -181,11 +181,10 @@ int custom_ext_add(SSL *s, int context, WPACKET *pkt, X509 *x, size_t chainidx,
 
         if ((context & (SSL_EXT_TLS1_2_SERVER_HELLO
                         | SSL_EXT_TLS1_3_SERVER_HELLO
-                        | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS)) != 0) {
-            /*
-             * For ServerHello/EncryptedExtensions only send extensions present
-             * in ClientHello.
-             */
+                        | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS
+                        | SSL_EXT_TLS1_3_CERTIFICATE
+                        | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST)) != 0) {
+            /* Only send extensions present in ClientHello. */
             if (!(meth->ext_flags & SSL_EXT_FLAG_RECEIVED))
                 continue;
         }