message: Symlink python 3.9 as well
diff: @@ -132,7 +132,7 @@ cp "./x86_64-pc-linux-gnu/libstdc++-v3/src/.libs/libstdc++_nonshared44.a" \
  # TODO(klimek): Automate linking in all non-gcc / non-kernel include
  # directories.
  mkdir -p "/${TARGET}/usr/include/x86_64-linux-gnu"
  -PYTHON_VERSIONS=("python3.6m" "python3.7m" "python3.8")
  +PYTHON_VERSIONS=("python3.6m" "python3.7m" "python3.8", "python3.9")
  for v in "${PYTHON_VERSIONS[@]}"; do
  ln -s "/usr/local/include/${v}" "/${TARGET}/usr/include/x86_64-linux-gnu/${v}"
  done
  