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Let's raise our supported baseline a bit: CLOCK_BOOTTIME started to work
with timerfd in kernel 3.15 (i.e. back in 2014), let's require support
for it now.
This will raise our baseline only modestly from 3.13 → 3.15.
We generally operate on the assumption that a source is "gone" as soon
as we unref it. This is generally true because we have the only reference.
But if something else holds the reference, our unref doesn't really stop
the source and it could fire again.
In particular, on_query_timeout() is called with DnsQuery* as userdata, and
it calls dns_query_stop() which invalidates that pointer. If it was ever
called again, we'd be accessing already-freed memory.
I don't see what would hold the reference. sd-event takes a temporary reference,
but on the sd_event object, not on the individual sources. And our sources
are non-floating, so there is no reference from the sd_event object to the
sources.
For #18427.
The "socket graveyard" shall contain sockets we have sent a question out
of, but not received a reply. If we'd close thus sockets immediately
when we are not interested anymore, we'd trigger ICMP port unreachable
messages once we after all *do* get a reply. Let's avoid that, by
leaving the fds open for a bit longer, until a timeout is reached or a
reply datagram received.
Fixes: #17421
