(mm-arglist-to-arguments): New function.

(mm-arglist-to-arguments): New function.
(mm-define-generic): New macro.
(mime-entity-cooked-p): Use `mm-define-generic'.
(mime-entity-point-min): Use `mm-define-generic'.
(mime-insert-decoded-header): Use `mm-define-generic'.
(mime-entity-content): Use `mm-define-generic'.
(mime-write-entity-content): Use `mm-define-generic'.
(mime-write-entity): Use `mm-define-generic'.
(mime-write-entity-body): Use `mm-define-generic'.