progmodes/prog-mode.el (prog-mode-hook): Made customizable.

https://lists.gnu.org/archive/html/emacs-devel/2013-12/msg00353.html
lisp/ChangeLog: Fix last entry.

I did not realize that a bug was filed for that patch.  Also "make"
instead of "made".
ibuffer.el (ibuffer-mode-map): Use toggle button for
`ibuffer-auto-mode' menu entry.
(ibuffer-mode-hook): Add `ibuffer-auto-mode' customization option.