qt: drop workaround for QTBUG-42503 which was fixed in Qt 5.5.0
qt: drop workaround for QTBUG-42503 which was fixed in Qt 5.5.0

Fixes https://github.com/bitcoin-core/gui/issues/101

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