build: add -fcf-protection=full to hardening options
build: add -fcf-protection=full to hardening options

Enables code instrumentation of control-flow transfers. Available in
GCC 8 and Clang 7.

This option is now on by default in Ubuntu GCC as of 19.10.

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