Take out a bunch of unused constants.

Code search confirms they're never used externally either.

Change-Id: Id90bc15e18555dcfd757b318ab7e2d3ca7c31661
Reviewed-on: https://boringssl-review.googlesource.com/8540
Reviewed-by: Steven Valdez <svaldez@google.com>
Reviewed-by: David Benjamin <davidben@google.com>

include/openssl/tls1.h

@@ -157,8 +157,6 @@ extern "C" {
 #endif
 
 
-#define TLS1_ALLOW_EXPERIMENTAL_CIPHERSUITES 0
-
 #define TLS1_AD_DECRYPTION_FAILED 21
 #define TLS1_AD_RECORD_OVERFLOW 22
 #define TLS1_AD_UNKNOWN_CA 48    /* fatal */
@@ -179,22 +177,9 @@ extern "C" {
 #define TLS1_AD_BAD_CERTIFICATE_HASH_VALUE 114
 #define TLS1_AD_UNKNOWN_PSK_IDENTITY 115 /* fatal */
 
-/* ExtensionType values from RFC3546 / RFC4366 / RFC6066 */
+/* ExtensionType values from RFC6066 */
 #define TLSEXT_TYPE_server_name 0
-#define TLSEXT_TYPE_max_fragment_length 1
-#define TLSEXT_TYPE_client_certificate_url 2
-#define TLSEXT_TYPE_trusted_ca_keys 3
-#define TLSEXT_TYPE_truncated_hmac 4
 #define TLSEXT_TYPE_status_request 5
-/* ExtensionType values from RFC4681 */
-#define TLSEXT_TYPE_user_mapping 6
-
-/* ExtensionType values from RFC5878 */
-#define TLSEXT_TYPE_client_authz 7
-#define TLSEXT_TYPE_server_authz 8
-
-/* ExtensionType values from RFC6091 */
-#define TLSEXT_TYPE_cert_type 9
 
 /* ExtensionType values from draft-ietf-tls-tls13-latest */
 #define TLSEXT_TYPE_supported_groups 10
@@ -202,18 +187,12 @@ extern "C" {
 /* ExtensionType values from RFC4492 */
 #define TLSEXT_TYPE_ec_point_formats 11
 
-/* ExtensionType value from RFC5054 */
-#define TLSEXT_TYPE_srp 12
-
 /* ExtensionType values from RFC5246 */
 #define TLSEXT_TYPE_signature_algorithms 13
 
 /* ExtensionType value from RFC5764 */
 #define TLSEXT_TYPE_srtp 14
 
-/* ExtensionType value from RFC5620 */
-#define TLSEXT_TYPE_heartbeat 15
-
 /* ExtensionType value from RFC7301 */
 #define TLSEXT_TYPE_application_layer_protocol_negotiation 16
 
@@ -244,7 +223,6 @@ extern "C" {
 /* ECPointFormat values from RFC 4492 */
 #define TLSEXT_ECPOINTFORMAT_uncompressed 0
 #define TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime 1
-#define TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2 2
 
 /* Signature and hash algorithms from RFC 5246 */
 
@@ -270,16 +248,6 @@ extern "C" {
 #define SSL_SIGN_ECDSA_SECP384R1_SHA384 0x0503
 #define SSL_SIGN_ECDSA_SECP521R1_SHA512 0x0603
 
-
-/* Flag set for unrecognised algorithms */
-#define TLSEXT_nid_unknown 0x1000000
-
-/* ECC curves */
-
-#define TLSEXT_curve_P_256 23
-#define TLSEXT_curve_P_384 24
-
-
 #define TLSEXT_MAXLEN_host_name 255
 
 /* PSK ciphersuites from 4279 */