The libcurl date parser returns INT_MAX for all dates > 2037 so this
test is now made to use 2037 instead of 2038 to work the same for both
32bit and 64bit time_t systems.
Implement: Expired Cookies These following situation, curl removes
cookie(s) from struct CookieInfo if the cookie expired.
- Curl_cookie_add()
- Curl_cookie_getlist()
- cookie_output()