**/*.py: use /usr/bin/env to find python

src/trusted/validator_arm/dgen_test_output.py

-#!/usr/bin/python
+#!/usr/bin/env python
 #
 # Copyright (c) 2012 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 
 """
 Responsible for generating the testing decoders based on
 parsed table representations.
 """
@@ skipping 995 matching lines @@
      values, to its corresponding index. This is done to reduce the
      number of compares to find the index, speeding up code
      generation.
      """
   lookup_map = {}
   index = 0
   for v in values:
     lookup_map[dgen_core.neutral_repr(v)] = index
     index += 1
   return lookup_map