Update async-inheritance.swift

Tweak test for macOS

Author: compnerd

test/IRGen/async-inheritance.swift

@@ -1,9 +1,15 @@
 // RUN: %empty-directory(%t)
-// RUN: %target-build-swift-dylib(%t/%target-library-name(L)) -module-name L -emit-module -emit-module-path %t/L.swiftmodule %s -DL
-// RUN: %target-build-swift -I%t -L%t -lL -parse-as-library %s -module-name E -o %t/E %target-rpath(%t)
+// RUN: %target-build-swift-dylib(%t/%target-library-name(L)) -Xfrontend -disable-availability-checking -module-name L -emit-module -emit-module-path %t/L.swiftmodule %s -DL
+// RUN: %target-build-swift -Xfrontend -disable-availability-checking -I%t -L%t -lL -parse-as-library %s -module-name E -o %t/E %target-rpath(%t)
 // RUN: %target-codesign %t/E
 // RUN: %target-run %t/E %t/%target-library-name(L) | %FileCheck %s
 
+// REQUIRES: concurrency
+// REQUIRES: concurrency_runtime
+// REQUIRES: executable_test
+
+// UNSUPPORTED: back_deployment_runtime
+
 #if L
 open class C {
   public init() {}