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

src/trusted/validator_arm/dgen_core.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.
 #
 
 """
 The core object model for the Decoder Generator.  The dg_input and
 dg_output modules both operate in terms of these classes.
 """
@@ skipping 2505 matching lines @@
      """
   return (lambda exp, return_type, options:
             (name if exp.matches_signature(([], type), return_type) != None
              else None))
 
 """Defines special processing fuctions if the signature matches."""
 _FUNCTION_TRANSLATION_MAP = {
     'ZeroExtend': [_TranslateZeroExtend, _ToBitFieldExtend],
     'SignExtend': [_TranslateSignExtend, _ToBitFieldExtend],
 }