remove usage of boost::bind
remove usage of boost::bind

boost::bind usage was removed in #13743. However a new usage snuck in as
part of 2bc4c3eaf96f5f8490fc79280422916c5d14cde3 (#15225).

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entsProject/elements,qtumproject/qtum,litecoin-project/litecoin,MarcoFalke/bitcoin,pataquets/namecoin-core,pataquets/namecoin-core,jnewbery/bitcoin,EthanHeilman/bitcoin,jlopp/statoshi,Xekyo/bitcoin,namecoin/namecore,jonasschnelli/bitcoin,instagibbs/bitcoin,lateminer/bitcoin,kallewoof/bitcoin,yenliangl/bitcoin,ElementsProject/elements,domob1812/namecore,mm-s/bitcoin,apoelstra/bitcoin,jamesob/bitcoin,sipsorcery/bitcoin,prusnak/bitcoin,domob1812/namecore,MarcoFalke/bitcoin,GroestlCoin/GroestlCoin,JeremyRubin/bitcoin,pstratem/bitcoin