Don't build gtk3 by default
Don't build gtk3 by default

sevoku/xwt,residuum/xwt,antmicro/xwt,mminns/xwt,lytico/xwt,cra0zy/xwt,directhex/xwt,steffenWi/xwt,TheBrainTech/xwt,hwthomas/xwt,mono/xwt,mminns/xwt,hamekoz/xwt,akrisiun/xwt,iainx/xwt