emacs-28 f2c0fb2615: Resurrect obsoletion warning for two functions

[Stefan Kangas]

branch: emacs-28
commit f2c0fb2615f4c1140f5eef52b19cb77b4e86cbb4
Author: Stefan Kangas <stefankangas@gmail.com>
Commit: Stefan Kangas <stefankangas@gmail.com>

    Resurrect obsoletion warning for two functions
    
    These were supposed to have been deleted, but never were.  Resurrect
    their obsoletion warning and let's delete them in Emacs 29 instead.
    
    * lisp/subr.el (process-filter-multibyte-p)
    (set-process-filter-multibyte): Resurrect obsoletion warning.
    * etc/NEWS: Don't announce their deletion.
---
 etc/NEWS     | 12 ++++++------
 lisp/subr.el |  2 ++
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/etc/NEWS b/etc/NEWS
index 1aa16a4c05..aeddb07170 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -3168,9 +3168,9 @@ ledit.el, lmenu.el, lucid.el and old-whitespace.el.
 'nnmail-fix-eudora-headers', 'non-iso-charset-alist',
 'nonascii-insert-offset', 'nonascii-translation-table',
 'password-read-and-add', 'pre-abbrev-expand-hook', 'princ-list',
-'print-help-return-message', 'process-filter-multibyte-p',
-'read-file-name-predicate', 'remember-buffer', 'rmail-highlight-face',
-'rmail-message-filter', 'semantic-after-idle-scheduler-reparse-hooks',
+'print-help-return-message', 'read-file-name-predicate',
+'remember-buffer', 'rmail-highlight-face', 'rmail-message-filter',
+'semantic-after-idle-scheduler-reparse-hooks',
 'semantic-after-toplevel-bovinate-hook',
 'semantic-before-idle-scheduler-reparse-hooks',
 'semantic-before-toplevel-bovination-hook',
@@ -3196,9 +3196,9 @@ ledit.el, lmenu.el, lucid.el and old-whitespace.el.
 'semantic-something-to-stream', 'semantic-tag-make-assoc-list',
 'semantic-token-type-parent', 'semantic-toplevel-bovine-cache',
 'semantic-toplevel-bovine-table', 'semanticdb-mode-hooks',
-'set-coding-priority', 'set-process-filter-multibyte',
-'shadows-compare-text-p', 'shell-dirtrack-toggle',
-'speedbar-navigating-speed', 'speedbar-update-speed', 't-mouse-mode',
+'set-coding-priority', 'shadows-compare-text-p',
+'shell-dirtrack-toggle', 'speedbar-navigating-speed',
+'speedbar-update-speed', 't-mouse-mode',
 'term-dynamic-simple-complete', 'tooltip-hook', 'tpu-have-ispell',
 'url-generate-unique-filename', 'url-temporary-directory',
 'vc-arch-command', 'vc-default-working-revision' (variable),
diff --git a/lisp/subr.el b/lisp/subr.el
index 921853de60..edd4e33962 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -1754,6 +1754,8 @@ be a list of the form returned by `event-start' and 
`event-end'."
 (make-obsolete-variable 'operating-system-release nil "28.1")
 
 (make-obsolete 'run-window-configuration-change-hook nil "27.1")
+(make-obsolete 'process-filter-multibyte-p nil "23.1")
+(make-obsolete 'set-process-filter-multibyte nil "23.1")
 
 (make-obsolete-variable 'command-debug-status
                         "expect it to be removed in a future version." "25.2")