message: Add clean_dep() around protobuf patch. Fixes TF when included as a submodule.
diff: @@ -385,7 +385,7 @@ def tf_workspace(path_prefix = "", tf_repo_name = ""):
  tf_http_archive(
  name = "com_google_protobuf",
  - patch_file = PROTOBUF_PATCH,
  + patch_file = clean_dep(PROTOBUF_PATCH),
  sha256 = PROTOBUF_SHA256,
  strip_prefix = PROTOBUF_STRIP_PREFIX,
  system_build_file = clean_dep("//third_party/systemlibs:protobuf.BUILD"),
  