add an internal extension so that CFStreamStatus can be converted to a raw value type in a cross platform manner

Author: phausler

Foundation/NSStream.swift

@@ -9,6 +9,14 @@
 
 import CoreFoundation
 
+#if os(OSX) || os(iOS)
+internal extension UInt {
+    init(_ status: CFStreamStatus) {
+        self.init(status.rawValue)
+    }
+}
+#endif
+
 extension Stream {
     public struct PropertyKey : RawRepresentable, Equatable, Hashable, Comparable {
         public private(set) var rawValue: String