Remove dead code reference (previous merge error).
Remove dead code reference (previous merge error).

swansontec/libbitcoin,GroestlCoin/libgroestlcoin,swansontec/libbitcoin,GroestlCoin/libgroestlcoin,GroestlCoin/libgroestlcoin,GroestlCoin/libgroestlcoin,swansontec/libbitcoin,swansontec/libbitcoin