knot-resolver: 4.0.0 -> 4.1.0 (security)

https://lists.nic.cz/pipermail/knot-resolver-users/2019/000189.html
Fixes DNS spoofing problems: CVE-2019-10190 CVE-2019-10191
but also minor things, adds new features, etc.
In particular aarch64 should work now, at least as long as not using
some lua library that suffers from the same problem with lightuserdata,
e.g. cqueues does suffer from this.