Make mh-funcall-if-exists obsolete

Make mh-funcall-if-exists obsolete

* lisp/mh-e/mh-acros.el (mh-funcall-if-exists): Make obsolete.
* lisp/mh-e/mh-alias.el (mh-read-address):
* lisp/mh-e/mh-folder.el (mh-folder-mode):
* lisp/mh-e/mh-mime.el (mh-mm-display-part):
* lisp/mh-e/mh-show.el (mh-defun-show-buffer):
* lisp/mh-e/mh-speed.el (mh-speedbar-change-expand-button-char):
* lisp/mh-e/mh-tool-bar.el (mh-tool-bar-define):
* lisp/mh-e/mh-utils.el (mh-logo-display):
* lisp/mh-e/mh-xface.el (mh-face-display-function): Don't use
above obsolete macro.