WinSDK: repair build on case insensitive file systems
WinSDK: repair build on case insensitive file systems

The Windows SDK includes `WinSock2.h` as `winsock2.h` in `WS2tcpip.h` which
breaks on case sensitive file systems such as ext4.

jmgc/swift,harlanhaskins/swift,CodaFi/swift,atrick/swift,tkremenek/swift,karwa/swift,xedin/swift,gribozavr/swift,tkremenek/swift,stephentyrone/swift,airspeedswift/swift,lorentey/swift,aschwaighofer/swift,airspeedswift/swift,shajrawi/swift,tkremenek/swift,xedin/swift,nathawes/swift,parkera/swift,JGiola/swift,aschwaighofer/swift,allevato/swift,xedin/swift,jckarter/swift,glessard/swift,gregomni/swift,xwu/swift,lorentey/swift,amraboelela/swift,practicalswift/swift,lorentey/swift,xedin/swift,harlanhaskins/swift,gribozavr/swift,shajrawi/swift,harlanhaskins/swift,amraboelela/swift,sschiau/swift,allevato/swift,gregomni/swift,practicalswift/swift,roambotics/swift,shahmishal/swift,glessard/swift,allevato/swift,shahmishal/swift,sschiau/swift,benlangmuir/swift,aschwaighofer/swift,karwa/swift,practicalswift/swift,shajrawi/swift,xwu/swift,devincoughlin/swift,allevato/swift,devincoughlin/swift,jckarter/swift,roambotics/swift,apple/swift,CodaFi/swift,practicalswift/swift,parkera/swift,practicalswift/swift,tkremenek/swift,karwa/swift,benlangmuir/swift,jmgc/swift,CodaFi/swift,roambotics/swift,roambotics/swift,rudkx/swift,glessard/swift,xedin/swift,harlanhaskins/swift,devincoughlin/swift,stephentyrone/swift,amraboelela/swift,shajrawi/swift,karwa/swift,airspeedswift/swift,apple/swift,tkremenek/swift,sschiau/swift,ahoppen/swift,jckarter/swift,gregomni/swift,amraboelela/swift,allevato/swift,jmgc/swift,lorentey/swift,apple/swift,hooman/swift,parkera/swift,stephentyrone/swift,parkera/swift,rudkx/swift,atrick/swift,JGiola/swift,karwa/swift,shajrawi/swift,xwu/swift,airspeedswift/swift,JGiola/swift,JGiola/swift,CodaFi/swift,practicalswift/swift,jmgc/swift,stephentyrone/swift,karwa/swift,CodaFi/swift,shajrawi/swift,nathawes/swift,rudkx/swift,gribozavr/swift,nathawes/swift,devincoughlin/swift,roambotics/swift,ahoppen/swift,hooman/swift,gregomni/swift,nathawes/swift,karwa/swift,sschiau/swift,jckarter/swift,gribozavr/swift,rudkx/swift,airspeedswift/swift,benlangmuir/swift,gregomni/swift,parkera/swift,xedin/swift,jmgc/swift,benlangmuir/swift,JGiola/swift,glessard/swift,ahoppen/swift,glessard/swift,ahoppen/swift,xedin/swift,gribozavr/swift,allevato/swift,harlanhaskins/swift,shahmishal/swift,sschiau/swift,xwu/swift,lorentey/swift,jmgc/swift,atrick/swift,rudkx/swift,apple/swift,devincoughlin/swift,xedin/swift,amraboelela/swift,hooman/swift,xwu/swift,shahmishal/swift,lorentey/swift,stephentyrone/swift,devincoughlin/swift,stephentyrone/swift,aschwaighofer/swift,airspeedswift/swift,roambotics/swift,shahmishal/swift,jmgc/swift,rudkx/swift,harlanhaskins/swift,JGiola/swift,airspeedswift/swift,shahmishal/swift,lorentey/swift,CodaFi/swift,lorentey/swift,sschiau/swift,shajrawi/swift,jckarter/swift,devincoughlin/swift,hooman/swift,atrick/swift,sschiau/swift,tkremenek/swift,aschwaighofer/swift,stephentyrone/swift,harlanhaskins/swift,parkera/swift,shajrawi/swift,shahmishal/swift,devincoughlin/swift,xwu/swift,CodaFi/swift,glessard/swift,ahoppen/swift,parkera/swift,amraboelela/swift,benlangmuir/swift,nathawes/swift,benlangmuir/swift,gribozavr/swift,aschwaighofer/swift,shahmishal/swift,nathawes/swift,hooman/swift,atrick/swift,sschiau/swift,parkera/swift,tkremenek/swift,atrick/swift,karwa/swift,amraboelela/swift,xwu/swift,jckarter/swift,gribozavr/swift,practicalswift/swift,allevato/swift,jckarter/swift,apple/swift,practicalswift/swift,aschwaighofer/swift,ahoppen/swift,gregomni/swift,hooman/swift,apple/swift,gribozavr/swift,hooman/swift,nathawes/swift