Ensure that the _Concurrency library re-exportes SwiftNativeNSObject.
Ensure that the _Concurrency library re-exportes SwiftNativeNSObject.

The CMake variables to control this were set *after* the inclusion of
the Concurrency library, so they didn't have any effect.

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