Convert tls_construct_client_hello() to use PACKETW

Reviewed-by: Rich Salz <rsalz@openssl.org>
diff --git a/ssl/d1_lib.c b/ssl/d1_lib.c
index 0ada7ed..043057f 100644
--- a/ssl/d1_lib.c
+++ b/ssl/d1_lib.c
@@ -44,6 +44,8 @@
     SSL_ENC_FLAG_DTLS | SSL_ENC_FLAG_EXPLICIT_IV,
     DTLS1_HM_HEADER_LENGTH,
     dtls1_set_handshake_header,
+    dtls1_set_handshake_header2,
+    dtls1_close_construct_packet,
     dtls1_handshake_write
 };
 
@@ -63,6 +65,8 @@
         | SSL_ENC_FLAG_SHA256_PRF | SSL_ENC_FLAG_TLS1_2_CIPHERS,
     DTLS1_HM_HEADER_LENGTH,
     dtls1_set_handshake_header,
+    dtls1_set_handshake_header2,
+    dtls1_close_construct_packet,
     dtls1_handshake_write
 };