Allow using test-wrapper-gypbuild.py on Windows when no python interpreter is registered.

tools/test-wrapper-gypbuild.py

 #!/usr/bin/env python
 #
 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 199 matching lines @@
   (options, args) = parser.parse_args()
   if not ProcessOptions(options):
     parser.print_help()
     return 1
 
   workspace = abspath(join(dirname(sys.argv[0]), '..'))
   returncodes = 0
 
   if not options.no_presubmit:
     print ">>> running presubmit tests"
-    returncodes += subprocess.call([workspace + '/tools/presubmit.py'])
+    returncodes += subprocess.call([sys.executable, 
+                                    workspace + '/tools/presubmit.py'])
 
   args_for_children = ['python']
   args_for_children += [workspace + '/tools/test.py'] + PassOnOptions(options)
   args_for_children += ['--no-build', '--build-system=gyp']
   for arg in args:
     args_for_children += [arg]
   env = os.environ
 
   for mode in options.mode:
     for arch in options.arch:
@@ skipping 25 matching lines @@
                              shell=True,
                              cwd=workspace,
                              env=env)
     returncodes = child.wait()
 
   return returncodes
 
 
 if __name__ == '__main__':
   sys.exit(Main())