message: [test] Check locally required tools.
  This 'fixes' the external-build-test.sh script (at least locally for me).
diff: @@ -26,7 +26,7 @@ rm -rf "$HOME/.cache/bazel"
  export KYTHE_VERSION=v0.0.38
  cd "${TMPDIR}"
  wget -q -O kythe.tar.gz \
  - https://github.com/kythe/kythe/releases/download/$KYTHE_VERSION/kythe-$KYTHE_VERSION.tar.gz
  + "https://github.com/kythe/kythe/releases/download/$KYTHE_VERSION/kythe-$KYTHE_VERSION.tar.gz"
  tar -xzf kythe.tar.gz
  export KYTHE_DIRNAME="kythe-${KYTHE_VERSION}"
  sudo cp -R "${KYTHE_DIRNAME}" /opt
  