Fix make and ninja backends to sensibly handle duplicate target names in different directories

test/same-target-name-different-directory/src/subdirs.gyp

Index: test/same-target-name-different-directory/src/subdirs.gyp
diff --git a/test/same-target-name-different-directory/src/subdirs.gyp b/test/same-target-name-different-directory/src/subdirs.gyp
new file mode 100644
index 0000000000000000000000000000000000000000..65413e73b2b8ca9b7e1dfc318bed24f529a25316
--- /dev/null
+++ b/test/same-target-name-different-directory/src/subdirs.gyp
@@ -0,0 +1,16 @@
+# Copyright (c) 2010 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.
+
+{
+  'targets': [
+    {
+      'target_name': 'subdirs',
+      'type': 'none',
+      'dependencies': [
+        'subdir1/subdir1.gyp:*',
+        'subdir2/subdir2.gyp:*',
+      ],
+    },
+  ],
+}