build, qt: Use `mkspecs/bitcoin-linux-g++` for all Linux hosts
build, qt: Use `mkspecs/bitcoin-linux-g++` for all Linux hosts

AkioNak/bitcoin,sipsorcery/bitcoin,sstone/bitcoin,particl/particl-core,fanquake/bitcoin,fanquake/bitcoin,jambolo/bitcoin,mruddy/bitcoin,namecoin/namecore,bitcoin/bitcoin,ajtowns/bitcoin,kallewoof/bitcoin,bitcoinsSG/bitcoin,ajtowns/bitcoin,mruddy/bitcoin,namecoin/namecoin-core,sipsorcery/bitcoin,Xekyo/bitcoin,fujicoin/fujicoin,lateminer/bitcoin,jamesob/bitcoin,sstone/bitcoin,bitcoinsSG/bitcoin,AkioNak/bitcoin,Xekyo/bitcoin,namecoin/namecoin-core,fujicoin/fujicoin,namecoin/namecore,fujicoin/fujicoin,fujicoin/fujicoin,AkioNak/bitcoin,Xekyo/bitcoin,bitcoinsSG/bitcoin,particl/particl-core,fanquake/bitcoin,jamesob/bitcoin,AkioNak/bitcoin,particl/particl-core,mruddy/bitcoin,AkioNak/bitcoin,sstone/bitcoin,lateminer/bitcoin,tecnovert/particl-core,ajtowns/bitcoin,kallewoof/bitcoin,jambolo/bitcoin,Xekyo/bitcoin,jamesob/bitcoin,sipsorcery/bitcoin,lateminer/bitcoin,bitcoinsSG/bitcoin,sipsorcery/bitcoin,jambolo/bitcoin,AkioNak/bitcoin,kallewoof/bitcoin,mruddy/bitcoin,particl/particl-core,jambolo/bitcoin,fujicoin/fujicoin,lateminer/bitcoin,tecnovert/particl-core,kallewoof/bitcoin,mruddy/bitcoin,bitcoin/bitcoin,jamesob/bitcoin,namecoin/namecore,sstone/bitcoin,namecoin/namecoin-core,namecoin/namecore,mruddy/bitcoin,jamesob/bitcoin,tecnovert/particl-core,bitcoin/bitcoin,sstone/bitcoin,jamesob/bitcoin,lateminer/bitcoin,bitcoin/bitcoin,Xekyo/bitcoin,tecnovert/particl-core,sstone/bitcoin,kallewoof/bitcoin,sipsorcery/bitcoin,namecoin/namecoin-core,tecnovert/particl-core,fanquake/bitcoin,Xekyo/bitcoin,namecoin/namecore,particl/particl-core,ajtowns/bitcoin,fujicoin/fujicoin,bitcoin/bitcoin,fanquake/bitcoin,bitcoinsSG/bitcoin,namecoin/namecoin-core,tecnovert/particl-core,bitcoinsSG/bitcoin,kallewoof/bitcoin,ajtowns/bitcoin,lateminer/bitcoin,jambolo/bitcoin,jambolo/bitcoin,ajtowns/bitcoin,sipsorcery/bitcoin,particl/particl-core,fanquake/bitcoin,namecoin/namecoin-core,namecoin/namecore,bitcoin/bitcoin