bind: security bump to version 9.11.0-P1

Fixes:
CVE-2016-8864 - denial-of-service vector which can potentially be
exploited against BIND 9 servers.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
[Thomas: fix hash URL in .hash file, noticed by Vicente.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>