Fix smart-http test due to changes in cookie sort order in curl-7.61.1
    
    With curl-7.61.1 cookies are sorted by creation-time¹.  Sort the output
    used in the 'cookies stored in http.cookiefile when http.savecookies
    set' test before comparing it to the expected cookies.
    
    ¹ https://github.com/curl/curl/commit/e2ef8d6fa ("cookies: support
      creation-time attribute for cookies", 2018-08-28)