Convert total timeout to per-query for Apple #467
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On Apple platforms, libresolv reports the total timeout in
retrans, not the per-query time. This patch undoes that math to get the per-query time, which is what c-ares expects. This is not perfect because libresolv is inconsistent on whether the timeout is multiplied byretryorretry+1, but I don't see any way to distinguish these cases.