attr: fix test on Windows
attr: fix test on Windows

`Int` on Windows x86_64 is different from `Int` on other targets due to
it being a LLP64 target.  Explicitly use the `Int32` type for the
enumeration to fix the test.

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