Log Message:
Unbound 1.4.20

Features:

* add libunbound.ttl at end of result structure, version bump for libunbound.
  Code compiled with 1.4.19 is binary compatible with the 1.4.20 library.
  If code uses the ttl it needs the 1.4.20 version.

Bug Fixes:

* Change of D.ROOT-SERVERS.NET A address in default root hints.
* Fix openssl lock free on exit.
* unbound-anchors checks the emailAddress of the signer of the root.xml file,
  default is dnssec@iana.org. It also checks that the signer has the correct
  key usage for a digital signature.
* printout name of zone with duplicate fwd and hint errors.
* includes and have_ssl fixes for nss.
* detect endianness in lookup3 on BSD.
* iana portlist updated.