get rid of NS_FOUNDATION_ALLOWS_TESTABLE_IMPORT

Author: albertaleksieiev

TestFoundation/TestStream.swift

@@ -6,14 +6,14 @@
 // See http://swift.org/LICENSE.txt for license information
 // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 //
-#if NS_FOUNDATION_ALLOWS_TESTABLE_IMPORT
-    #if (os(Linux) || os(Android))
-        @testable import Foundation
-    #else
-        @testable import SwiftFoundation
-    #endif
+
+#if (os(Linux) || os(Android))
+    @testable import Foundation
+#else
+    @testable import SwiftFoundation
 #endif
 
+
 private extension Data {
     init(reading input: InputStream) {
         self.init()