DNS resolver daemon. Mostly to move gethostbyname out of libc.

Listens for requests on /run/dns, does DNS stuff, replies back.

With this in place, gethostbyname() should devolve into a simple

socket-connect-send-recv sequence, with little to no parsing and

definitely no config reading and such.

Configuration: unclear. All things considered, it would be great

to have some sort of zero-config, so root queries, so probably not

that good. Lacking that, something really static like 8.8.8.8, but

again that's Google so not good either. Querying 192.168.1.1 in home

network should be an option too.

Relying on DHCP is tricky. Including the question on whether to rely

on DHCP-supplied data at all.

References: musl gethostbyname

Alternative approach: a service that would take a hostname and return

an open socket fd. This would make it relatively easy to handle transport

protocols including TLS and TOR in a sane way from the application

perspective, but it is not clear whether all necessary tools can be

re-implemented to use such a service.