(message-use-idna): Use mm-coding-system-p.

(message-use-idna): Use mm-coding-system-p.
(message-tokenize-header, message-make-organization)
(message-make-from):  Use with-temp-buffer.
(message-set-work-buffer): Deleted.
(message-fill-paragraph): Use `if' not `and' for compiler warning.
(message-check-news-header-syntax): Remove useless lambda.
(message-forward-make-body): Use mm-disable-multibyte,
mm-with-unibyte-current-buffer, mm-enable-multibyte.
(message-replace-chars-in-string): Deleted.