Use MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM to enable ssl_write_encrypt_then_mac_ext()

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/library/ssl_tls12_server.c b/library/ssl_tls12_server.c
index facf09b..0bc668f 100644
--- a/library/ssl_tls12_server.c
+++ b/library/ssl_tls12_server.c
@@ -1971,7 +1971,7 @@
 }
 #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
 
-#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+#if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM)
 static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
                                             unsigned char *buf,
                                             size_t *olen )
@@ -2016,7 +2016,7 @@
 
     *olen = 4;
 }
-#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
+#endif /* MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM */
 
 #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
 static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl,
@@ -2585,7 +2585,7 @@
     ext_len += olen;
 #endif
 
-#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
+#if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM)
     ssl_write_encrypt_then_mac_ext( ssl, p + 2 + ext_len, &olen );
     ext_len += olen;
 #endif