* emulation/edt-mapper.el (edt-emacs-variant): Replace the only

* emulation/edt-mapper.el (edt-emacs-variant): Replace the only
use with the definition. Remove.

* add-log.el (change-log-start-entry-re): New defconst.
(change-log-sortable-date-at): Use it.
(change-log-beginning-of-defun, change-log-end-of-defun): New
functions.
(change-log-mode): Use them for beginning-of-defun-function and
end-of-defun-function.

* erc-ibuffer.el (erc-modified-channels-alist): Pacify
byte-compiler.