[dns-operations] adns vuln posted

[Paul Vixie]

> libbind in BIND 9 has the same problem, by the way.

libbind, lacking asynchrony, can reasonably expect its callers to either
lockstep their queries, or if threaded, to do their own birthday protection.

adns, possessing asynchrony and offering it as a feature, needs birthday
protection.

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