Move client_version into SSL_HANDSHAKE.

There is no need to retain it beyond this point.

Change-Id: Ib5722ab30fc013380198b1582d1240f0fe0aa770
Reviewed-on: https://boringssl-review.googlesource.com/12620
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/ssl/internal.h b/ssl/internal.h
index 19f6bc1..995adcf 100644
--- a/ssl/internal.h
+++ b/ssl/internal.h
@@ -1020,6 +1020,9 @@
   /* ticket_expected is one if a TLS 1.2 NewSessionTicket message is to be sent
    * or received. */
   unsigned ticket_expected:1;
+
+  /* client_version is the value sent or received in the ClientHello version. */
+  uint16_t client_version;
 } /* SSL_HANDSHAKE */;
 
 SSL_HANDSHAKE *ssl_handshake_new(SSL *ssl);