Unbound 1.6.1 has a few bug fixes for resource leaks,
configuration robustness, compile environment interaction,
and maintaining the trust anchor. The 2017 trust anchor
(DS) is built into unbound and unbound-anchor.

File /etc/unbound/root.key holds 2010/2017 DS record until 2018
https://www.icann.org/resources/pages/ksk-rollover
https://www.iana.org/domains/root

Signed-off-by: Eric Luehrsen <ericluehrsen@hotmail.com>

This is an import of the net/unbound package from Subversion
revision 40658 (May 2, 2014). The only change is the addition of
PKG_LICENSE, PKG_LICENSE_FILE and PKG_MAINTAINER to Makefile.
Unbound 1.4.22 is the current upstream release.

Signed-off-by: Michael Hanselmann <public@hansmi.ch>