Do not remote duplicate entries from ldflags when generating ninja files as it changes behavior

test/ldflags-duplicates/check-ldflags.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.
+
+"""
+Verifies duplicate ldflags are not removed.
+"""
+
+import sys
+
+def CheckContainsFlags(args, substring):
+  if args.find(substring) is -1:
+    print 'ERROR: Linker arguments "%s" are missing in "%s"' % (substring, args)
+    return False;
+  return True;
+
+if __name__ == '__main__':
+  args = " ".join(sys.argv)
+  print  "args = " +args
+  if not CheckContainsFlags(args, 'lib1.a -Wl,--no-whole-archive') \
+    or not CheckContainsFlags(args, 'lib2.a -Wl,--no-whole-archive'):
+    sys.exit(1);
+  sys.exit(0)