Adjust to changes in bind 9.11.5
Custom types like isc_boolean_t and isc_uint32_t were removed from bind
headers. Compatibility headers are included, but have to be manually
used. Better change would be to start using uint32_t and bool types,
but that changes too much of code for now.
Signed-off-by: Petr Menšík <pemensik@redhat.com>