Fix gyp->make translation of rules with several outputs.

test/actions-multiple-outputs-with-dependencies/src/rcopy.py

+#!/usr/bin/env python
+#
+# Copyright (c) 2015 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+import sys
+
+"""A slightly odd 'cp' implementation for this test.
+
+This 'cp' can have many targets, but only one source. 'cp src dest1 dest2'
+will copy the file 'src' to both 'dest1' and 'dest2'."""
+
+with open(sys.argv[1], 'r') as f:
+  src = f.read()
+for dest in sys.argv[2:]:
+  with open(dest, 'w') as f:
+    f.write(src)
+