Merge branch '112-fix-mx-checks-for-dynamic-updates-v9_12-v9_11' into 'v9_11'

Fix MX checks for dynamic updates

Closes #112

See merge request isc-projects/bind9!79

diff --cc bin/named/update.c
index 4a33363342fdd18c0b16806aec3e9508fd391716,66f484e8bb2965bf56a125df29ec12ca92343dbe..42ed96c3e5a7124583968f58befb9b3b8e9867da
--- 1/bin/named/update.c
--- 2/bin/named/update.c
+++ b/bin/named/update.c
@@@ -6,8 -6,8 +6,6 @@@
   * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   */
  
--/* $Id: update.c,v 1.199 2011/12/22 07:32:40 each Exp $ */
--
  #include <config.h>
  
  #include <isc/netaddr.h>