Statically link libstdc++ on Linux to prevent issues with newer libstc++
Statically link libstdc++ on Linux to prevent issues with newer libstc++

Contributes to Ultimaker/Uranium#42

ROBO3D/CuraEngine,fxtentacle/CuraEngine,Ultimaker/CuraEngine,alephobjects/CuraEngine,ROBO3D/CuraEngine,markwal/CuraEngine,uus169/CuraEngine,totalretribution/CuraEngine,ROBO3D/CuraEngine,totalretribution/CuraEngine,mspark93/CuraEngine,alex1818/CuraEngine,Ultimaker/CuraEngine,uus169/CuraEngine,mspark93/CuraEngine,pratikshashroff/pcura,alex1818/CuraEngine,patrick3coffee/CuraTinyG,patrick3coffee/CuraTinyG,fxtentacle/CuraEngine,markwal/CuraEngine,pratikshashroff/pcura,alex1818/CuraEngine,mspark93/CuraEngine,pratikshashroff/pcura,alephobjects/CuraEngine,totalretribution/CuraEngine,jacobdai/CuraEngine-1,patrick3coffee/CuraTinyG,jacobdai/CuraEngine-1,markwal/CuraEngine,alephobjects/CuraEngine,uus169/CuraEngine,jacobdai/CuraEngine-1,fxtentacle/CuraEngine