Revert "Correctly detect the ability to use the Swift Concurrency runtime on Darwin platforms"
Revert "Correctly detect the ability to use the Swift Concurrency runtime on Darwin platforms"

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