Update references to RFCs.

Some code predated the RFCs themselves, but the RFCs now exist. Also remove
now obsolete comments and some unused #defines.

See upstream's cffeacd91e70712c99c431bf32a655fa1b561482. (Though this predates
it; I just remembered I never uploaded it.)

Change-Id: I5e56f0ab6b7f558820f72e84dfdbc71a8c23cb91
Reviewed-on: https://boringssl-review.googlesource.com/2475
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/ssl/ssl_locl.h b/ssl/ssl_locl.h
index bf11bec..4adc2c8 100644
--- a/ssl/ssl_locl.h
+++ b/ssl/ssl_locl.h
@@ -410,9 +410,7 @@
 #define PENDING_SESSION -10000
 #define CERTIFICATE_SELECTION_PENDING -10001
 
-/* From ECC-TLS draft, used in encoding the curve type in 
- * ECParameters
- */
+/* From RFC4492, used in encoding the curve type in ECParameters */
 #define EXPLICIT_PRIME_CURVE_TYPE  1   
 #define EXPLICIT_CHAR2_CURVE_TYPE  2
 #define NAMED_CURVE_TYPE           3