message: Use git formatting specifiers that is compatible with older
  versions of git.
diff: # Invoke bazel with --workspace_status_command=bazel/build-version.sh to
  # get this invoked and populate bazel-out/volatile-status.sh
  -LOCAL_GIT_DATE="$(git log -n1 --format='%cs' 2>/dev/null)"
  +LOCAL_GIT_DATE="$(git log -n1 --date=short --format='%cd' 2>/dev/null)"
  LOCAL_GIT_VERSION="$(git describe 2>/dev/null)"
  # If we get these values above, overwrite potentially set environment variables.
  