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

src/trusted/validator_arm/dgen_actuals.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 actual decoders based on parsed table
 representations.
 
@@ skipping 423 matching lines @@
   return dgen_output.GetDecodersBlock(n, separators,
                                       GetActualDecoders(decoder),
                                       _ActualNameLessActualPrefix)
 
 def _ActualNameLessActualPrefix(decoder):
   name = ActualName(decoder)
   if name.startswith('Actual_'):
     return name[len('Actual_'):]
   else:
     return name