editors/emacs-devel: Update to 2022-08-16 snapshot

This fixes the problem that devel_full and devel_nox flavors of some
ports depending on emacs fail to be built with following error
message.

Symbol's function definition is void: update-directory-autoloads

Changes: https://github.com/emacs-mirror/emacs/compare/11e6c12...cf873c1