(url-cookie-parse-file): Don't complain of missing file.

(url-cookie-parse-file): Don't complain of missing file.
(url-cookie-parse-file, url-cookie-write-file, url-cookie-retrieve)
(url-cookie-generate-header-lines, url-cookie-handle-set-cookie)
(url-cookie-setup-save-timer): Remove autoload cookies.
They're only called from files that require url-cookie anyway.