Make sure we define availability macros for standalone library builds
Make sure we define availability macros for standalone library builds

Fixes rdar://85639438.

glessard/swift,JGiola/swift,ahoppen/swift,glessard/swift,glessard/swift,rudkx/swift,gregomni/swift,JGiola/swift,ahoppen/swift,roambotics/swift,benlangmuir/swift,roambotics/swift,rudkx/swift,JGiola/swift,rudkx/swift,JGiola/swift,benlangmuir/swift,atrick/swift,roambotics/swift,ahoppen/swift,JGiola/swift,atrick/swift,apple/swift,roambotics/swift,glessard/swift,glessard/swift,atrick/swift,apple/swift,gregomni/swift,ahoppen/swift,gregomni/swift,benlangmuir/swift,apple/swift,gregomni/swift,glessard/swift,apple/swift,rudkx/swift,benlangmuir/swift,atrick/swift,benlangmuir/swift,benlangmuir/swift,apple/swift,roambotics/swift,gregomni/swift,atrick/swift,JGiola/swift,ahoppen/swift,rudkx/swift,gregomni/swift,apple/swift,roambotics/swift,ahoppen/swift,atrick/swift,rudkx/swift