Both `rb_ensure` and `udp_bind_internal` return `VALUE`.

This _partially_ reverts commit
d2ba8ea54a4089959afdeecdd963e3c4ff391748, but for UDP sockets only.

With TCP sockets (and other things which use `rsock_init_inetsock`), the
order of operations is to call `getaddrinfo(3)` with AF_UNSPEC, look at
the returned addresses, pick one, and then call `socket(2)` with the
family for that address (i.e. AF_INET or AF_INET6).

With UDP sockets, however, this is reversed; `UDPSocket.new` takes an
address family as an argument, and then calls `socket(2)` with that
family. A subsequent call to UDPSocket#connect will then call
`getaddrinfo(3)` with that family.

The problem here is that...

* If you are in a networking situation that _only_ has loopback addrs,
* And you want to look up a name like "localhost" (or NULL)
* And you pass AF_INET or AF_INET6 as the ai_family argument to
  getaddrinfo(3),
* And you pass AI_ADDRCONFIG to the hints argument as well,

then glibc on Linux will not return an address. This is because
AI_ADDRCONFIG is supposed to return addresses for families we actually
have an address for and could conceivably connect to, but also is
documented to explicitly ignore localhost in that situation.

It honestly doesn't make a ton of sense to pass AI_ADDRCONFIG if you're
explicitly passing the address family anyway, because you're not looking
for "an address for this name we can connect to"; you're looking for "an
IPv(4|6) address for this name". And the original glibc bug that
d2ba8ea5 was supposed to work around was related to parallel issuance of
A and AAAA queries, which of course won't happen if an address family is
explicitly specified.

So, we fix this by not passing AI_ADDRCONFIG for calls to
`rsock_addrinfo` that we also pass an explicit family to (i.e. for
UDPsocket).

[Bug #20048]

When making an outgoing TCP or UDP connection, set AI_ADDRCONFIG in the
hints we send to getaddrinfo(3) (if supported). This will prompt the
resolver to _NOT_ issue A or AAAA queries if the system does not
actually have an IPv4 or IPv6 address (respectively).

This makes outgoing connections marginally more efficient on
non-dual-stack systems, since we don't have to try connecting to an
address which can't possibly work.

More importantly, however, this works around a race condition present
in some older versions of glibc on aarch64 where it could accidently
send the two outgoing DNS queries with the same DNS txnid, and get
confused when receiving the responses. This manifests as outgoing
connections sometimes taking 5 seconds (the DNS timeout before retry) to
be made.

Fixes #19144

[Misc #18891]