Add compile flags for universal mac binary.
Add compile flags for universal mac binary.

daid/CuraCutEngine,pratikshashroff/pcura,mspark93/CuraEngine,fxtentacle/CuraEngine,mspark93/CuraEngine,foosel/CuraEngine,alex1818/CuraEngine,totalretribution/CuraEngine,be3d/CuraEngine,daid/CuraCutEngine,phonyphonecall/CuraEngine,derekhe/CuraEngine,jacobdai/CuraEngine-1,Ultimaker/CuraEngine,markwal/CuraEngine,be3d/CuraEngine,ROBO3D/CuraEngine,Intrinsically-Sublime/CuraEngine,robotustra/curax,pratikshashroff/pcura,alex1818/CuraEngine,mspark93/CuraEngine,Jwis921/PersonalCuraEngine,Jwis921/PersonalCuraEngine,jacobdai/CuraEngine-1,pratikshashroff/pcura,electrocbd/CuraEngine,phonyphonecall/CuraEngine,electrocbd/CuraEngine,phonyphonecall/CuraEngine,markwal/CuraEngine,Skeen/CuraJS-Engine,fxtentacle/CuraEngine,markwal/CuraEngine,foosel/CuraEngine,fxtentacle/CuraEngine,derekhe/CuraEngine,uus169/CuraEngine,Skeen/CuraJS-Engine,patrick3coffee/CuraTinyG,alephobjects/CuraEngine,robotustra/curax,Ultimaker/CuraEngine,patrick3coffee/CuraTinyG,uus169/CuraEngine,foosel/CuraEngine,totalretribution/CuraEngine,Intrinsically-Sublime/CuraEngine,robotustra/curax,ROBO3D/CuraEngine,ROBO3D/CuraEngine,be3d/CuraEngine,totalretribution/CuraEngine,uus169/CuraEngine,electrocbd/CuraEngine,patrick3coffee/CuraTinyG,Skeen/CuraJS-Engine,alex1818/CuraEngine,Jwis921/PersonalCuraEngine,alephobjects/CuraEngine,jacobdai/CuraEngine-1,Intrinsically-Sublime/CuraEngine,derekhe/CuraEngine,alephobjects/CuraEngine