(private-char-area-1-min)

(private-char-area-1-min)
(private-char-area-1-max, private-char-area-2-min)
(private-char-area-2-max, emacs-mule-charset-table): New
variables.
(convert-define-charset-argument): New function.
(define-charset): Handle the old calling style.  Update
emacs-mule-charset-table.
(make-char-internal): New function.