Fix missing header in sync.h
Fix missing header in sync.h

practicalswift/bitcoin,rnicoll/bitcoin,JeremyRubin/bitcoin,jonasschnelli/bitcoin,fujicoin/fujicoin,anditto/bitcoin,ElementsProject/elements,DigitalPandacoin/pandacoin,mm-s/bitcoin,mruddy/bitcoin,monacoinproject/monacoin,peercoin/peercoin,namecoin/namecore,instagibbs/bitcoin,sipsorcery/bitcoin,achow101/bitcoin,rnicoll/bitcoin,fujicoin/fujicoin,ahmedbodi/vertcoin,midnightmagic/bitcoin,MarcoFalke/bitcoin,jamesob/bitcoin,litecoin-project/litecoin,particl/particl-core,apoelstra/bitcoin,sipsorcery/bitcoin,jonasschnelli/bitcoin,instagibbs/bitcoin,ajtowns/bitcoin,kallewoof/bitcoin,pstratem/bitcoin,namecoin/namecoin-core,ajtowns/bitcoin,pstratem/bitcoin,anditto/bitcoin,kallewoof/bitcoin,GroestlCoin/GroestlCoin,Sjors/bitcoin,sstone/bitcoin,rnicoll/bitcoin,jamesob/bitcoin,achow101/bitcoin,qtumproject/qtum,peercoin/peercoin,jamesob/bitcoin,alecalve/bitcoin,particl/particl-core,JeremyRubin/bitcoin,fanquake/bitcoin,ElementsProject/elements,andreaskern/bitcoin,litecoin-project/litecoin,qtumproject/qtum,dscotese/bitcoin,pstratem/bitcoin,rnicoll/dogecoin,Xekyo/bitcoin,fanquake/bitcoin,bitcoinsSG/bitcoin,bitcoinsSG/bitcoin,jlopp/statoshi,practicalswift/bitcoin,jonasschnelli/bitcoin,sipsorcery/bitcoin,JeremyRubin/bitcoin,alecalve/bitcoin,vertcoin/vertcoin,bitcoin/bitcoin,achow101/bitcoin,qtumproject/qtum,Sjors/bitcoin,monacoinproject/monacoin,n1bor/bitcoin,sstone/bitcoin,apoelstra/bitcoin,Sjors/bitcoin,rnicoll/bitcoin,lateminer/bitcoin,EthanHeilman/bitcoin,practicalswift/bitcoin,jnewbery/bitcoin,mm-s/bitcoin,pataquets/namecoin-core,apoelstra/bitcoin,anditto/bitcoin,JeremyRubin/bitcoin,litecoin-project/litecoin,monacoinproject/monacoin,domob1812/bitcoin,andreaskern/bitcoin,particl/particl-core,MeshCollider/bitcoin,instagibbs/bitcoin,domob1812/namecore,namecoin/namecoin-core,pstratem/bitcoin,namecoin/namecoin-core,monacoinproject/monacoin,alecalve/bitcoin,MarcoFalke/bitcoin,vertcoin/vertcoin,domob1812/bitcoin,ajtowns/bitcoin,n1bor/bitcoin,midnightmagic/bitcoin,tecnovert/particl-core,AkioNak/bitcoin,bitcoinknots/bitcoin,peercoin/peercoin,ajtowns/bitcoin,rnicoll/dogecoin,ahmedbodi/vertcoin,jlopp/statoshi,MarcoFalke/bitcoin,kallewoof/bitcoin,domob1812/namecore,ahmedbodi/vertcoin,ahmedbodi/vertcoin,namecoin/namecore,JeremyRubin/bitcoin,jonasschnelli/bitcoin,GroestlCoin/GroestlCoin,GroestlCoin/GroestlCoin,jlopp/statoshi,rnicoll/bitcoin,AkioNak/bitcoin,yenliangl/bitcoin,mruddy/bitcoin,ElementsProject/elements,jambolo/bitcoin,mruddy/bitcoin,MarcoFalke/bitcoin,instagibbs/bitcoin,dscotese/bitcoin,practicalswift/bitcoin,midnightmagic/bitcoin,tecnovert/particl-core,ElementsProject/elements,ajtowns/bitcoin,cdecker/bitcoin,GroestlCoin/bitcoin,instagibbs/bitcoin,achow101/bitcoin,dscotese/bitcoin,cdecker/bitcoin,cdecker/bitcoin,bitcoinsSG/bitcoin,jamesob/bitcoin,peercoin/peercoin,midnightmagic/bitcoin,prusnak/bitcoin,pataquets/namecoin-core,domob1812/namecore,prusnak/bitcoin,sipsorcery/bitcoin,bitcoinknots/bitcoin,pstratem/bitcoin,jnewbery/bitcoin,Xekyo/bitcoin,peercoin/peercoin,pataquets/namecoin-core,ElementsProject/elements,dscotese/bitcoin,peercoin/peercoin,practicalswift/bitcoin,achow101/bitcoin,tecnovert/particl-core,kallewoof/bitcoin,vertcoin/vertcoin,bitcoinsSG/bitcoin,n1bor/bitcoin,alecalve/bitcoin,yenliangl/bitcoin,sstone/bitcoin,ajtowns/bitcoin,prusnak/bitcoin,lateminer/bitcoin,fujicoin/fujicoin,achow101/bitcoin,rnicoll/dogecoin,cdecker/bitcoin,particl/particl-core,particl/particl-core,andreaskern/bitcoin,GroestlCoin/bitcoin,lateminer/bitcoin,GroestlCoin/bitcoin,sipsorcery/bitcoin,qtumproject/qtum,jambolo/bitcoin,EthanHeilman/bitcoin,pstratem/bitcoin,jamesob/bitcoin,DigitalPandacoin/pandacoin,MeshCollider/bitcoin,MarcoFalke/bitcoin,practicalswift/bitcoin,mm-s/bitcoin,mruddy/bitcoin,sstone/bitcoin,jamesob/bitcoin,AkioNak/bitcoin,sstone/bitcoin,prusnak/bitcoin,domob1812/namecore,yenliangl/bitcoin,Sjors/bitcoin,ahmedbodi/vertcoin,MarcoFalke/bitcoin,GroestlCoin/bitcoin,DigitalPandacoin/pandacoin,ahmedbodi/vertcoin,pataquets/namecoin-core,dscotese/bitcoin,n1bor/bitcoin,prusnak/bitcoin,mruddy/bitcoin,kallewoof/bitcoin,tecnovert/particl-core,andreaskern/bitcoin,bitcoin/bitcoin,GroestlCoin/GroestlCoin,namecoin/namecore,alecalve/bitcoin,bitcoinknots/bitcoin,vertcoin/vertcoin,anditto/bitcoin,Xekyo/bitcoin,Xekyo/bitcoin,tecnovert/particl-core,litecoin-project/litecoin,fanquake/bitcoin,jambolo/bitcoin,rnicoll/dogecoin,vertcoin/vertcoin,GroestlCoin/bitcoin,MeshCollider/bitcoin,fanquake/bitcoin,alecalve/bitcoin,ElementsProject/elements,MeshCollider/bitcoin,apoelstra/bitcoin,fujicoin/fujicoin,jambolo/bitcoin,namecoin/namecoin-core,lateminer/bitcoin,bitcoinknots/bitcoin,lateminer/bitcoin,jlopp/statoshi,EthanHeilman/bitcoin,midnightmagic/bitcoin,lateminer/bitcoin,instagibbs/bitcoin,bitcoin/bitcoin,DigitalPandacoin/pandacoin,mm-s/bitcoin,domob1812/bitcoin,sstone/bitcoin,jlopp/statoshi,jonasschnelli/bitcoin,cdecker/bitcoin,monacoinproject/monacoin,domob1812/namecore,jnewbery/bitcoin,pataquets/namecoin-core,jnewbery/bitcoin,anditto/bitcoin,mruddy/bitcoin,litecoin-project/litecoin,particl/particl-core,dscotese/bitcoin,domob1812/bitcoin,midnightmagic/bitcoin,sipsorcery/bitcoin,qtumproject/qtum,Sjors/bitcoin,domob1812/bitcoin,fujicoin/fujicoin,andreaskern/bitcoin,kallewoof/bitcoin,DigitalPandacoin/pandacoin,fanquake/bitcoin,MeshCollider/bitcoin,fujicoin/fujicoin,bitcoin/bitcoin,andreaskern/bitcoin,yenliangl/bitcoin,qtumproject/qtum,cdecker/bitcoin,mm-s/bitcoin,litecoin-project/litecoin,prusnak/bitcoin,namecoin/namecore,mm-s/bitcoin,namecoin/namecoin-core,yenliangl/bitcoin,EthanHeilman/bitcoin,bitcoin/bitcoin,n1bor/bitcoin,vertcoin/vertcoin,domob1812/bitcoin,bitcoin/bitcoin,monacoinproject/monacoin,namecoin/namecore,tecnovert/particl-core,rnicoll/bitcoin,MeshCollider/bitcoin,apoelstra/bitcoin,namecoin/namecore,Xekyo/bitcoin,rnicoll/dogecoin,anditto/bitcoin,AkioNak/bitcoin,namecoin/namecoin-core,GroestlCoin/GroestlCoin,AkioNak/bitcoin,jnewbery/bitcoin,GroestlCoin/GroestlCoin,Xekyo/bitcoin,n1bor/bitcoin,bitcoinsSG/bitcoin,bitcoinknots/bitcoin,EthanHeilman/bitcoin,domob1812/namecore,jambolo/bitcoin,jambolo/bitcoin,DigitalPandacoin/pandacoin,fanquake/bitcoin,AkioNak/bitcoin,pataquets/namecoin-core,GroestlCoin/bitcoin,yenliangl/bitcoin,apoelstra/bitcoin,JeremyRubin/bitcoin,jlopp/statoshi,bitcoinsSG/bitcoin,EthanHeilman/bitcoin,qtumproject/qtum