[Build] Added switch to SharpDX.targets to allow selecting DX version - 11 or 11.1
[Build] Added switch to SharpDX.targets to allow selecting DX version - 11 or 11.1

weltkante/SharpDX,fmarrabal/SharpDX,waltdestler/SharpDX,VirusFree/SharpDX,manu-silicon/SharpDX,TechPriest/SharpDX,mrvux/SharpDX,TechPriest/SharpDX,TigerKO/SharpDX,TigerKO/SharpDX,Ixonos-USA/SharpDX,andrewst/SharpDX,jwollen/SharpDX,wyrover/SharpDX,fmarrabal/SharpDX,PavelBrokhman/SharpDX,VirusFree/SharpDX,dazerdude/SharpDX,manu-silicon/SharpDX,weltkante/SharpDX,manu-silicon/SharpDX,sharpdx/SharpDX,weltkante/SharpDX,VirusFree/SharpDX,waltdestler/SharpDX,mrvux/SharpDX,davidlee80/SharpDX-1,fmarrabal/SharpDX,Ixonos-USA/SharpDX,jwollen/SharpDX,wyrover/SharpDX,dazerdude/SharpDX,wyrover/SharpDX,jwollen/SharpDX,RobyDX/SharpDX,PavelBrokhman/SharpDX,fmarrabal/SharpDX,wyrover/SharpDX,sharpdx/SharpDX,davidlee80/SharpDX-1,dazerdude/SharpDX,waltdestler/SharpDX,davidlee80/SharpDX-1,jwollen/SharpDX,TigerKO/SharpDX,Ixonos-USA/SharpDX,PavelBrokhman/SharpDX,TechPriest/SharpDX,RobyDX/SharpDX,davidlee80/SharpDX-1,sharpdx/SharpDX,mrvux/SharpDX,andrewst/SharpDX,TigerKO/SharpDX,weltkante/SharpDX,manu-silicon/SharpDX,Ixonos-USA/SharpDX,waltdestler/SharpDX,RobyDX/SharpDX,PavelBrokhman/SharpDX,andrewst/SharpDX,TechPriest/SharpDX,dazerdude/SharpDX,VirusFree/SharpDX,RobyDX/SharpDX