Defragment incoming TLS handshake messages

Signed-off-by: Deomid rojer Ryabkov <rojer@rojer.me>
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index fff5339..eb60c78 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -1808,6 +1808,8 @@
 
     size_t MBEDTLS_PRIVATE(in_hslen);            /*!< current handshake message length,
                                                     including the handshake header   */
+    unsigned char *MBEDTLS_PRIVATE(in_hshdr);    /*!< original handshake header start  */
+    size_t MBEDTLS_PRIVATE(in_hsfraglen);        /*!< accumulated hs fragments length  */
     int MBEDTLS_PRIVATE(nb_zero);                /*!< # of 0-length encrypted messages */
 
     int MBEDTLS_PRIVATE(keep_current_message);   /*!< drop or reuse current message