OpenSSL: add support for the TLS padding extension.

openssl/ssl/s23_clnt.c

Index: openssl/ssl/s23_clnt.c
diff --git a/openssl/ssl/s23_clnt.c b/openssl/ssl/s23_clnt.c
index 2d0f51dab82ee69028c42213f96f0dd7a93dcc97..08ee86d105987fd56d44fca7615cbb99ed79ba1d 100644
--- a/openssl/ssl/s23_clnt.c
+++ b/openssl/ssl/s23_clnt.c
@@ -466,7 +466,10 @@ static int ssl23_client_hello(SSL *s)
 			{
 			/* create Client Hello in SSL 3.0/TLS 1.0 format */
 
-			/* do the record header (5 bytes) and handshake message header (4 bytes) last */
+			/* do the record header (5 bytes) and handshake message
+			 * header (4 bytes) last. Note: the code to add the
+			 * padding extension in t1_lib.c depends on the size of
+			 * this prefix. */
 			d = p = &(buf[9]);
 			
 			*(p++) = version_major;