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

src/trusted/validator_ragel/obtain_binutils.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.
 
 """Obtain objdump and gas binaries.
 
 Usage:
     obtain_binutils.py <objdump> <gas>
 
@@ skipping 61 matching lines @@
     shutil.copy(os.path.join(CHECKOUT_DIR, 'binutils', 'objdump'), objdump)
     shutil.copy(os.path.join(CHECKOUT_DIR, 'gas', 'as-new'), gas)
   finally:
     shutil.rmtree(CHECKOUT_DIR)
 
   print 'ok'
 
 
 if __name__ == '__main__':
   main()