Simon Kelley 3b5ddf37d9 Fix problem with arbitrary RR caching.
Caching an answer which has more that one RR, with at least
one answer being <=13 bytes and at least one being >13 bytes
can screw up the F_KEYTAG flag bit, resulting in the wrong
type of the address union being used and either a bad value
return or a crash in the block code.

Thanks to Dominik Derigs and the Pi-hole project for finding
and characterising this.
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