gg -> gemexp and better wording.

in this codepath. otherwise we end up with a mismatch where we expect a request but were sent a response.

otherwise we send the request id N and expect to receive N+1

all other rules are freeing the value of `listen_addr'

default_host needs to be NULL for getaddrinfo(3) to listen on everything.

There's no much we can do if we resolv an IPv6 address but its support is disabled in the current kernel, so ignore and go ahead. Spotted while testing gmid i n a FreeBSD jail without IPv6.

unused, un-updated and ignored for quite some time now.

They're not needed on OpenBSD nor in other systems... except under sandbox. These were added for capsicum() if I remember correctly, but also with landlock it's better to initialize these things earlier.

this time targetting ABI level 3; partially based on how claudio@ handled it in rpki-client. Fun how this bit of code has come full circle (gmid inspired what I wrote for got, which inspired what was written for rpki-client, which has come back.)