net/bind911: update to 9.11.16

Update bind911 to 9.11.16 (BIND 9.11.16).

--- 9.11.16 released ---

5353. [doc] Document port and dscp parameters in forwarders
configuration option. [GL #914]

5352. [bug] Correctly handle catalog zone entries containing
characters that aren't legal in filenames. [GL #1592]

5351. [bug] CDS / CDNSKEY consistency checks failed to handle
removal records. [GL #1554]

5350. [bug] When a view was configured with class CHAOS,
dns_view_findzonecut() could incorrectly return
success for non-existent records. [GL #1540]

5348. [bug] dnssec-settime -Psync was not being honoured.
[GL !2925]

(taca)