* SECURITY UPDATE: denial of service via delegation handling defect
  - limit max recursion in bin/named/config.c, bin/named/query.c,
    bin/named/server.c, lib/dns/adb.c, lib/dns/include/dns/adb.h,
    lib/dns/include/dns/resolver.h, lib/dns/resolver.c,
    lib/export/isc/Makefile.in, lib/isc/Makefile.in, lib/isc/counter.c,
    lib/isc/include/isc/counter.h, lib/isc/include/isc/Makefile.in,
    lib/isc/include/isc/types.h, lib/isc/tests/counter_test.c,
    lib/isccfg/namedconf.c.
  - Based on patch provided by upstream.
  - CVE-2014-8500