dns/{ldns,p5-DNS-Ldns,py-ldns}: Update 1.8.4 => 1.9.0, improve port

Changelog:
https://github.com/NLnetLabs/ldns/blob/1.9.0/Changelog

Improve port:

• Switch from "ifs" in goals to goals for options.
• Remove old dead code - unused variable NO_GOST.
• Fix warnings from portclippy.
• Rework "if" for master and slave ports.
• Sort pkg-plist.

PR: 291573
Co-authored-by: Vladimir Druzenko <vvd@FreeBSD.org>