Cite an RFC over 9000 (draft-ietf-quic-tls is now RFC 9001).

Also now that it's finalized, flip the default for
SSL_set_quic_use_legacy_codepoint.

Update-Note: QUIC APIs now default to the standard code point rather
than the draft one. QUICHE has already been calling
SSL_set_quic_use_legacy_codepoint, so this should not affect them. Once
callers implementing the draft versions cycle out, we can then drop
SSL_set_quic_use_legacy_codepoint altogether. I've also bumped
BORINGSSL_API_VERSION in case we end up needing an ifdef.

Change-Id: Id2cab66215f4ad4c1e31503d329c0febfdb4603e
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/47864
Reviewed-by: David Schinazi <dschinazi@google.com>
Reviewed-by: Adam Langley <agl@google.com>

ssl/t1_lib.cc

diff --git a/ssl/t1_lib.cc b/ssl/t1_lib.cc
index 67f18fd..420b6ee 100644
--- a/ssl/t1_lib.cc
+++ b/ssl/t1_lib.cc
@@ -2646,7 +2646,7 @@
     return true;
   }
 
-  uint16_t extension_type = TLSEXT_TYPE_quic_transport_parameters_standard;
+  uint16_t extension_type = TLSEXT_TYPE_quic_transport_parameters;
   if (hs->config->quic_use_legacy_codepoint) {
     extension_type = TLSEXT_TYPE_quic_transport_parameters_legacy;
   }
@@ -2782,7 +2782,7 @@
     return true;
   }
 
-  uint16_t extension_type = TLSEXT_TYPE_quic_transport_parameters_standard;
+  uint16_t extension_type = TLSEXT_TYPE_quic_transport_parameters;
   if (hs->config->quic_use_legacy_codepoint) {
     extension_type = TLSEXT_TYPE_quic_transport_parameters_legacy;
   }
@@ -3251,7 +3251,7 @@
     dont_add_serverhello,
   },
   {
-    TLSEXT_TYPE_quic_transport_parameters_standard,
+    TLSEXT_TYPE_quic_transport_parameters,
     NULL,
     ext_quic_transport_params_add_clienthello,
     ext_quic_transport_params_parse_serverhello,