dns/knot-resolver: upgrade 4.1.0 -> 4.2.2, fix breakage due to knot2-lib upgrade

PR: 242411
Reported by: antoine
Approved by: Leo Vandewoestijne <freebsd@dns.company> (maintainer)
Relnotes: https://www.knot-resolver.cz/2019-07-10-knot-resolver-4.1.0.html
https://www.knot-resolver.cz/2019-08-05-knot-resolver-4.2.0.html
https://www.knot-resolver.cz/2019-09-26-knot-resolver-4.2.1.html
https://www.knot-resolver.cz/2019-09-26-knot-resolver-4.2.2.html