docs: def unlink(link):
      """os.unlink() but handle junction points on Windows.
      """
      if islink(link) and platform.system() == "Windows" and sys.version_info[:2] < (3, 5):
          # deleting junction points was added to os.unlink in 3.5
          # https://bugs.python.org/issue18314
          subprocess.check_call(["rmdir", link], shell=True)
      else:
          os.unlink(link)