(rfc822/parse-ascii-token): New function.

(rfc822/parse-ascii-token): New function.
(rfc822/parse-word, rfc822/parse-local-part, rfc822/parse-sub-domain,
rfc822/parse-domain, rfc822/parse-at-domain, rfc822/parse-route,
rfc822/parse-route-addr, rfc822/parse-group, rfc822/parse-addresses):
Use function `rfc822/parse-ascii-token' instead of
`rfc822/parse-token'.