message: fix build break in windows
diff: @@ -125,7 +125,7 @@ class ONNXCommand(setuptools.Command):
  class build_proto_in(ONNXCommand):
  def run(self):
  log('compiling onnx.proto.in')
  - subprocess.check_call([os.path.join(SRC_DIR, "gen_proto.py")])
  + subprocess.check_call(["python", os.path.join(SRC_DIR, "gen_proto.py")])
  class build_proto(ONNXCommand):
  