Add DTLS_with_buffers_method.

WebRTC will need this (probably among other things) to lose crypto/x509
at some point.

Bug: chromium:706445
Change-Id: I988e7300c4d913986b6ebbd1fa4130548dde76a4
Reviewed-on: https://boringssl-review.googlesource.com/18904
Reviewed-by: David Benjamin <davidben@google.com>
diff --git a/ssl/internal.h b/ssl/internal.h
index 8e70ea7..c8ed13b 100644
--- a/ssl/internal.h
+++ b/ssl/internal.h
@@ -1554,6 +1554,10 @@
  * crypto/x509. */
 extern const SSL_X509_METHOD ssl_crypto_x509_method;
 
+/* ssl_noop_x509_method provides the |SSL_X509_METHOD| functions that avoid
+ * crypto/x509. */
+extern const SSL_X509_METHOD ssl_noop_x509_method;
+
 struct SSL3_RECORD {
   /* type is the record type. */
   uint8_t type;