bind: security bump to version 9.11.0-P2

bind: security bump to version 9.11.0-P2

Bugfixes:

 - CVE-2016-9131: A malformed response to an ANY query can cause an
   assertion failure during recursion

 - CVE-2016-9147: An error handling a query response containing inconsistent
   DNSSEC information could cause an assertion failure

 - CVE-2016-9444: An unusually-formed DS record response could cause an
   assertion failure

 - CVE-2016-9778: An error handling certain queries using the
   nxdomain-redirect feature could cause a REQUIRE assertion failure in db.c

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>