test: define the target architecture for Windows
test: define the target architecture for Windows

When building on Windows, we need to ensure that the system headers are
aware of what target architecture is being targeted.  This fixes some of
the test failures on Windows.

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