message: Fix the TFLM github bazel CI.
  We stub out unnecessary SKylark functions to keep the TFLM bazel build
  quick enough to be run as part of CI. As a result, the bazel CI can be
  broken when skylark changes are made.
diff: @@ -16,6 +16,9 @@ tf_cc_test = cc_test
  def py_test(deps = [], data = [], kernels = [], exec_properties = None, **kwargs):
  pass
  +def pybind_extension(**kwargs):
  + pass
  +
  def if_not_windows(a):
  return select({
  clean_dep("//tensorflow:windows"): [],
  