Allow Platform.executable for JIT app snapshots.

tests/standalone/io/signals_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+// OtherResources=signal_test_script.dart
+// OtherResources=signals_test_script.dart
+
 import "dart:io";
 import "dart:convert";
 
 import "package:expect/expect.dart";
 import "package:async_helper/async_helper.dart";
 
 void testSignals(int usr1Expect,
                  int usr2Expect,
                  [int usr1Send,
                   int usr2Send,
@@ skipping 110 matching lines @@
   testSignal(ProcessSignal.SIGWINCH);
 
   testMultipleSignals([
       ProcessSignal.SIGHUP,
       ProcessSignal.SIGINT,
       ProcessSignal.SIGTERM,
       ProcessSignal.SIGUSR1,
       ProcessSignal.SIGUSR2,
       ProcessSignal.SIGWINCH]);
 }