Renumber to avoid a error code clash

Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2758)

include/openssl/ssl.h

@@ -2503,7 +2503,7 @@ int ERR_load_SSL_strings(void);
 # define SSL_R_ERROR_SETTING_TLSA_BASE_DOMAIN             204
 # define SSL_R_EXCESSIVE_MESSAGE_SIZE                     152
 # define SSL_R_EXTRA_DATA_IN_MESSAGE                      153
-# define SSL_R_EXT_LENGTH_MISMATCH                        162
+# define SSL_R_EXT_LENGTH_MISMATCH                        163
 # define SSL_R_FAILED_TO_INIT_ASYNC                       405
 # define SSL_R_FRAGMENTED_CLIENT_HELLO                    401
 # define SSL_R_GOT_A_FIN_BEFORE_A_CCS                     154