Ignore BIP-152 HB requests from non-witness peers.
Ignore BIP-152 HB requests from non-witness peers.

To speed up block propagation  BIP-152 allows peers to signal that
 they would like us to announce new blocks to them by just sending
 a compact block.  But propagation speed through non-witness peers
 is irrelevant, so ignore the request for these and save bandwidth.

Instead we'll just send them a header and they can getdata the
 (compact)block if they actually need it from us.

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