message: Fix configuration problem when not building with cuda-clang on missing
  cuda_toolkit_path dict entry.
diff: @@ -1139,6 +1139,7 @@ def _create_local_cuda_repository(repository_ctx):
  )
  cuda_defines = {}
  cuda_defines["%{builtin_sysroot}"] = tf_sysroot
  + cuda_defines["%{cuda_toolkit_path}"] = ""
  if is_cuda_clang:
  cuda_defines["%{cuda_toolkit_path}"] = cuda_config.config["cuda_toolkit_path"]
  