#206 Compile on BIND 9.16.16
Merged by abbra. Opened by pemensik.
pemensik/bind-dyndb-ldap bind-9.16.16-support  into  master

Do not check validity of ISCAPI pointers, isc_task_t were made private.
Reduce also passing of task pointer where they are never used.

rebased onto 55ea24d66e4120b3c1370e931897028054caa554

Pull-Request has been merged by abbra