Log Message:
Update ruby-dnsruby to 1.59.0.

pkgsrc change: license to apache-2.0.

## v1.59.0

* Add LICENSE file
* Add Cache max_size (gihub issue 64)
* Disable caching for SOA lookups in demo check_soa.rb
* Fix for invalid nameserver in config
* Fix encoding for OPT data (thanks Craig Despeaux)
* Various test system fixes
* OPT fixes
* DNSSEC verification failure handling wrt lack of DS chain
* DNSSEC validation policy name constants
* Fix for BOGUS DLV chains
* demo upgrades
* Resolver hints improvements