Set appveyor vm version to previous Visual Studio 2019 release.
Set appveyor vm version to previous Visual Studio 2019 release.

Latest vm version has updated cmake and the berkeleydb vcpkg now fails to build.

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