Package ncdns in distros' package repos

[JeremyRand]

It would be useful to package ncdns in various distros' package repos.

• ncdns status on Repology.
• Unbound status on Repology.

Sub-tickets:

• Package for Debian #154
• Consider other JSON-RPC clients instead of btcd #189

Hacktoberfest participants:

• Package repos participating in Hacktoberfest meta#77

[rnhmjoj]

I've packaged ncdns in Nixpkgs.
It's one of the most complicated program I've ever did and it's currently half-broken: you can build it if you already have the go modules, but fetching them no longer works.

There are several reasons:

1. you need to patch the standard library (x509)
2. it's a go module but it doesn't have a go.mod
3. it's not reproducible because of 2
4. it doesn't build with go >1.17

If you could make the build saner I'm sure more people will package it.

[hlandau]

ncdns is not a Go module.

[JeremyRand]

Also potentially relevant: #189