Merge branch '112-fix-mx-checks-for-dynamic-updates-v9_10' into 'v9_10'

Fix MX checks for dynamic updates

Closes #112

See merge request isc-projects/bind9!79

diff --cc CHANGES
Simple merge

diff --cc bin/named/update.c
index 981204fe10b0e129180ab89c22884c402f8f2e67,ac2321b280b9d5059fcbe27457f7bcc1d89c4dfc..b5141c37fac1bc67c8978e6aec5551dd1348cf69
--- 1/bin/named/update.c
--- 2/bin/named/update.c
+++ b/bin/named/update.c
@@@ -15,8 -15,8 +15,6 @@@
   * PERFORMANCE OF THIS SOFTWARE.
   */
  
--/* $Id: update.c,v 1.199 2011/12/22 07:32:40 each Exp $ */
--
  #include <config.h>
  
  #include <isc/netaddr.h>