build: remove `IS_STDLIB` from `_add_swift_host_library_single`
build: remove `IS_STDLIB` from `_add_swift_host_library_single`

airspeedswift/swift,allevato/swift,hooman/swift,harlanhaskins/swift,hooman/swift,jckarter/swift,gregomni/swift,nathawes/swift,CodaFi/swift,tkremenek/swift,CodaFi/swift,parkera/swift,hooman/swift,rudkx/swift,harlanhaskins/swift,ahoppen/swift,glessard/swift,glessard/swift,allevato/swift,allevato/swift,gregomni/swift,parkera/swift,airspeedswift/swift,apple/swift,harlanhaskins/swift,roambotics/swift,airspeedswift/swift,benlangmuir/swift,stephentyrone/swift,parkera/swift,jmgc/swift,harlanhaskins/swift,glessard/swift,CodaFi/swift,jmgc/swift,stephentyrone/swift,stephentyrone/swift,apple/swift,apple/swift,jckarter/swift,benlangmuir/swift,allevato/swift,gregomni/swift,xwu/swift,rudkx/swift,airspeedswift/swift,tkremenek/swift,jckarter/swift,jckarter/swift,aschwaighofer/swift,atrick/swift,gregomni/swift,roambotics/swift,CodaFi/swift,jckarter/swift,allevato/swift,jmgc/swift,glessard/swift,tkremenek/swift,allevato/swift,tkremenek/swift,JGiola/swift,hooman/swift,jckarter/swift,rudkx/swift,benlangmuir/swift,benlangmuir/swift,harlanhaskins/swift,stephentyrone/swift,tkremenek/swift,xwu/swift,apple/swift,parkera/swift,JGiola/swift,jckarter/swift,aschwaighofer/swift,nathawes/swift,jmgc/swift,JGiola/swift,atrick/swift,atrick/swift,parkera/swift,hooman/swift,airspeedswift/swift,JGiola/swift,airspeedswift/swift,xwu/swift,rudkx/swift,harlanhaskins/swift,nathawes/swift,parkera/swift,aschwaighofer/swift,jmgc/swift,roambotics/swift,ahoppen/swift,CodaFi/swift,JGiola/swift,stephentyrone/swift,CodaFi/swift,apple/swift,jmgc/swift,atrick/swift,rudkx/swift,ahoppen/swift,rudkx/swift,stephentyrone/swift,roambotics/swift,ahoppen/swift,aschwaighofer/swift,xwu/swift,roambotics/swift,nathawes/swift,airspeedswift/swift,tkremenek/swift,gregomni/swift,aschwaighofer/swift,hooman/swift,ahoppen/swift,jmgc/swift,nathawes/swift,xwu/swift,gregomni/swift,hooman/swift,nathawes/swift,xwu/swift,glessard/swift,ahoppen/swift,aschwaighofer/swift,benlangmuir/swift,benlangmuir/swift,atrick/swift,JGiola/swift,glessard/swift,stephentyrone/swift,parkera/swift,aschwaighofer/swift,roambotics/swift,xwu/swift,tkremenek/swift,nathawes/swift,parkera/swift,allevato/swift,atrick/swift,harlanhaskins/swift,apple/swift,CodaFi/swift