blockA blocks the answer if it is blocked by local blocklists. If blocklistStamp is not empty, it resolves them to blocklist names, if valid; and treats as if q was blocked by remote blocklists, effectively skipping local blocks. t, t2 can be nil. if non-nil, they are used to skip local blocks for a
(t, t2 Transport, q, ans *dns.Msg, blocklistStamp string)
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