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

src/trusted/validator_ragel/byte_machines.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.
 
 # Creates byte_machines.rl file.  Each machine accepts exactly one byte.
 #
 # In the name of a machine "0" means "unset bit", "1" means "set bit", "x" or
 # "X" mean "any bit", other letters are ignored.  Prefix "b_" is used as
 # convention to distinguish these autogenerated machines from the hand-written
 # ones, underscores do not matter and are used to separate bitfields in a byte
@@ skipping 195 matching lines @@
   print
 
   for byte_machine in byte_machines:
     print '  %s = %s;' % (byte_machine, MatchingBytes(byte_machine))
 
   print '}%%'
 
 
 if __name__ == '__main__':
   main()