Mark all def* functions that should indent as `defun'

Mark all def* functions that should indent as `defun'

* lisp/abbrev.el (define-abbrev):
(define-abbrev-table): Mark all functions that have names that
start with "def" that should indent according to the current
heuristics (bug#43329).
* lisp/autoinsert.el (define-auto-insert):

* lisp/button.el (define-button-type):

* lisp/subr.el (define-key-after):
(define-mail-user-agent):
(define-keymap):

* lisp/widget.el (define-widget):

* lisp/emacs-lisp/package.el (define-package):

* lisp/international/mule-cmds.el (define-char-code-property):

* lisp/international/mule.el (define-charset):
(define-coding-system):
(define-translation-table):
(define-translation-hash-table):