build: update ax_cxx_compile_stdcxx to serial 14
build: update ax_cxx_compile_stdcxx to serial 14

namecoin/namecore,ajtowns/bitcoin,tecnovert/particl-core,jambolo/bitcoin,achow101/bitcoin,ajtowns/bitcoin,anditto/bitcoin,particl/particl-core,particl/particl-core,instagibbs/bitcoin,anditto/bitcoin,jamesob/bitcoin,achow101/bitcoin,sstone/bitcoin,tecnovert/particl-core,namecoin/namecore,fujicoin/fujicoin,instagibbs/bitcoin,anditto/bitcoin,Xekyo/bitcoin,tecnovert/particl-core,GroestlCoin/GroestlCoin,jamesob/bitcoin,kallewoof/bitcoin,AkioNak/bitcoin,namecoin/namecoin-core,lateminer/bitcoin,fujicoin/fujicoin,namecoin/namecoin-core,domob1812/bitcoin,sipsorcery/bitcoin,fanquake/bitcoin,jamesob/bitcoin,fujicoin/fujicoin,jlopp/statoshi,andreaskern/bitcoin,jambolo/bitcoin,fanquake/bitcoin,andreaskern/bitcoin,domob1812/bitcoin,GroestlCoin/GroestlCoin,mruddy/bitcoin,mruddy/bitcoin,Xekyo/bitcoin,mruddy/bitcoin,Xekyo/bitcoin,dscotese/bitcoin,bitcoin/bitcoin,GroestlCoin/GroestlCoin,sstone/bitcoin,andreaskern/bitcoin,sipsorcery/bitcoin,GroestlCoin/bitcoin,kallewoof/bitcoin,particl/particl-core,GroestlCoin/bitcoin,tecnovert/particl-core,Xekyo/bitcoin,jamesob/bitcoin,bitcoin/bitcoin,achow101/bitcoin,instagibbs/bitcoin,ajtowns/bitcoin,GroestlCoin/GroestlCoin,sstone/bitcoin,domob1812/bitcoin,AkioNak/bitcoin,sipsorcery/bitcoin,mruddy/bitcoin,andreaskern/bitcoin,andreaskern/bitcoin,ajtowns/bitcoin,bitcoinsSG/bitcoin,jambolo/bitcoin,lateminer/bitcoin,namecoin/namecore,dscotese/bitcoin,bitcoin/bitcoin,bitcoin/bitcoin,anditto/bitcoin,namecoin/namecoin-core,achow101/bitcoin,particl/particl-core,jambolo/bitcoin,fanquake/bitcoin,particl/particl-core,andreaskern/bitcoin,dscotese/bitcoin,namecoin/namecore,kallewoof/bitcoin,jambolo/bitcoin,jamesob/bitcoin,sipsorcery/bitcoin,fanquake/bitcoin,tecnovert/particl-core,bitcoinsSG/bitcoin,namecoin/namecore,fujicoin/fujicoin,achow101/bitcoin,kallewoof/bitcoin,sstone/bitcoin,mruddy/bitcoin,domob1812/bitcoin,Xekyo/bitcoin,jlopp/statoshi,fujicoin/fujicoin,bitcoinsSG/bitcoin,bitcoin/bitcoin,kallewoof/bitcoin,jambolo/bitcoin,AkioNak/bitcoin,lateminer/bitcoin,lateminer/bitcoin,jlopp/statoshi,GroestlCoin/bitcoin,sstone/bitcoin,kallewoof/bitcoin,namecoin/namecoin-core,ajtowns/bitcoin,GroestlCoin/bitcoin,bitcoin/bitcoin,bitcoinsSG/bitcoin,jlopp/statoshi,sipsorcery/bitcoin,dscotese/bitcoin,jamesob/bitcoin,domob1812/bitcoin,AkioNak/bitcoin,AkioNak/bitcoin,mruddy/bitcoin,instagibbs/bitcoin,ajtowns/bitcoin,namecoin/namecoin-core,jlopp/statoshi,anditto/bitcoin,bitcoinsSG/bitcoin,instagibbs/bitcoin,sstone/bitcoin,GroestlCoin/bitcoin,jlopp/statoshi,tecnovert/particl-core,anditto/bitcoin,fanquake/bitcoin,lateminer/bitcoin,bitcoinsSG/bitcoin,instagibbs/bitcoin,sipsorcery/bitcoin,Xekyo/bitcoin,fanquake/bitcoin,AkioNak/bitcoin,namecoin/namecoin-core,GroestlCoin/bitcoin,domob1812/bitcoin,achow101/bitcoin,namecoin/namecore,fujicoin/fujicoin,dscotese/bitcoin,lateminer/bitcoin,GroestlCoin/GroestlCoin,dscotese/bitcoin,GroestlCoin/GroestlCoin,particl/particl-core