message: Make cache dir only if it does not exist
diff: @@ -79,7 +79,7 @@ if [ ! -d /tensorflow_src ]; then
  done
  if [ -z ${BAZEL_CACHE_DIR} ]; then
  - mkdir "bazel-build-cache"
  + mkdir -p "bazel-build-cache"
  BAZEL_CACHE_DIR="$PWD/bazel-build-cache"
  ARGUMENTS="${ARGUMENTS} --cache_dir=${BAZEL_CACHE_DIR}"
  fi
  