Fix python scripts in src/tools/

tools/generate_stubs/generate_stubs.py

-#!/usr/bin/python
-#
+#!/usr/bin/env python
 # Copyright (c) 2011 The Chromium 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 windows and posix stub files for a given set of signatures.
 
 For libraries that need to be loaded outside of the standard executable startup
 path mechanism, stub files need to be generated for the wanted functions.  In
 windows, this is done via "def" files and the delay load mechanism.  On a posix
 system, a set of stub functions need to be generated that dispatch to functions
@@ skipping 1032 matching lines @@
   if options.type == FILE_TYPE_WIN:
     CreateWindowsLibForSigFiles(args, out_dir, intermediate_dir)
   elif options.type == FILE_TYPE_POSIX_STUB:
     CreatePosixStubsForSigFiles(args, options.stubfile_name, out_dir,
                                 intermediate_dir, options.path_from_source,
                                 options.extra_stub_header)
 
 
 if __name__ == '__main__':
   main()