editors/emacs-devel: Update to 2023-08-20 snapshot

* Update regular expressions used to modify lisp/loadup.el at
  pre-configure target

Changes:	https://github.com/emacs-mirror/emacs/compare/18e7bc8...fd1479a
Reviewed by:	ashish, jrm
Differential Revision:	https://reviews.freebsd.org/D41514