dns64: improve with policy.FORWARD or .STUB
Clearing the query flags lead to kresd iterating over authoritative servers. Related: https://gitlab.labs.nic.cz/knot/resolver/issues/217 Note that validation of synthesised AAAA behind a CNAME doesn't work when policy.FORWARD + dns64. Example: www.regiojet.cz. policy.STUB + dns64 seems not to work at all.
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