Fix BFB support.
Fix BFB support.

Jwis921/PersonalCuraEngine,ROBO3D/CuraEngine,patrick3coffee/CuraTinyG,foosel/CuraEngine,pratikshashroff/pcura,derekhe/CuraEngine,totalretribution/CuraEngine,ROBO3D/CuraEngine,alephobjects/CuraEngine,electrocbd/CuraEngine,fxtentacle/CuraEngine,jacobdai/CuraEngine-1,markwal/CuraEngine,phonyphonecall/CuraEngine,electrocbd/CuraEngine,markwal/CuraEngine,Ultimaker/CuraEngine,be3d/CuraEngine,foosel/CuraEngine,mspark93/CuraEngine,Jwis921/PersonalCuraEngine,fxtentacle/CuraEngine,mspark93/CuraEngine,pratikshashroff/pcura,be3d/CuraEngine,uus169/CuraEngine,alex1818/CuraEngine,derekhe/CuraEngine,foosel/CuraEngine,Jwis921/PersonalCuraEngine,totalretribution/CuraEngine,phonyphonecall/CuraEngine,mspark93/CuraEngine,alex1818/CuraEngine,patrick3coffee/CuraTinyG,jacobdai/CuraEngine-1,derekhe/CuraEngine,uus169/CuraEngine,alex1818/CuraEngine,phonyphonecall/CuraEngine,Ultimaker/CuraEngine,markwal/CuraEngine,electrocbd/CuraEngine,fxtentacle/CuraEngine,totalretribution/CuraEngine,be3d/CuraEngine,uus169/CuraEngine,patrick3coffee/CuraTinyG,pratikshashroff/pcura,alephobjects/CuraEngine,jacobdai/CuraEngine-1,ROBO3D/CuraEngine,alephobjects/CuraEngine