WinSDK: extract System submodule with winioctl.h
WinSDK: extract System submodule with winioctl.h

Currently this header gets included into `WinSDK.WinSock2` via windows.h & winscard.h

parkera/swift,parkera/swift,hooman/swift,apple/swift,benlangmuir/swift,gregomni/swift,JGiola/swift,rudkx/swift,apple/swift,gregomni/swift,parkera/swift,jmgc/swift,rudkx/swift,ahoppen/swift,parkera/swift,hooman/swift,glessard/swift,apple/swift,ahoppen/swift,benlangmuir/swift,tkremenek/swift,apple/swift,xwu/swift,hooman/swift,parkera/swift,roambotics/swift,xwu/swift,JGiola/swift,jmgc/swift,ahoppen/swift,atrick/swift,tkremenek/swift,atrick/swift,ahoppen/swift,jmgc/swift,glessard/swift,atrick/swift,benlangmuir/swift,gregomni/swift,hooman/swift,roambotics/swift,xwu/swift,glessard/swift,JGiola/swift,rudkx/swift,benlangmuir/swift,roambotics/swift,benlangmuir/swift,tkremenek/swift,gregomni/swift,JGiola/swift,benlangmuir/swift,apple/swift,tkremenek/swift,tkremenek/swift,xwu/swift,rudkx/swift,JGiola/swift,hooman/swift,jmgc/swift,glessard/swift,atrick/swift,atrick/swift,hooman/swift,parkera/swift,gregomni/swift,tkremenek/swift,atrick/swift,glessard/swift,xwu/swift,jmgc/swift,parkera/swift,ahoppen/swift,roambotics/swift,hooman/swift,jmgc/swift,roambotics/swift,xwu/swift,rudkx/swift,tkremenek/swift,xwu/swift,ahoppen/swift,JGiola/swift,apple/swift,gregomni/swift,rudkx/swift,jmgc/swift,roambotics/swift,parkera/swift,glessard/swift