[Build System: CMake] Fix the arch-specific target exporting in add_swift_target_library to export targets for all the defined archs rather than _just_ the last one processed in the foreach loop above.
[Build System: CMake] Fix the arch-specific target exporting in add_swift_target_library to export targets for all the defined archs rather than _just_ the last one processed in the foreach loop above.

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