Remove obsolete Mule-UCS information (the package is not redundant).

etc/PROBLEMS

@@ -956,79 +956,6 @@ If you read such characters from UTF-16 or UTF-7 data, they are
 substituted with the Unicode `replacement character', and you lose
 information.
 
-** Mule-UCS loads very slowly.
-
-Changes to Emacs internals interact badly with Mule-UCS's `un-define'
-library, which is the usual interface to Mule-UCS.  Apply the
-following patch to Mule-UCS 0.84 and rebuild it.  That will help,
-though loading will still be slower than in Emacs 20.  (Some
-distributions, such as Debian, may already have applied such a patch.)
-
---- lisp/un-define.el	6 Mar 2001 22:41:38 -0000	1.30
-+++ lisp/un-define.el	19 Apr 2002 18:34:26 -0000
-@@ -610,13 +624,21 @@ by calling post-read-conversion and pre-
-
-  (mapcar
-   (lambda (x)
--    (mapcar
--     (lambda (y)
--       (mucs-define-coding-system
--	(nth 0 y) (nth 1 y) (nth 2 y)
--	(nth 3 y) (nth 4 y) (nth 5 y) (nth 6 y))
--       (coding-system-put (car y) 'alias-coding-systems (list (car x))))
--     (cdr x)))
-+    (if (fboundp 'register-char-codings)
-+	;; Mule 5, where we don't need the eol-type specified and
-+	;; register-char-codings may be very slow for these coding
-+	;; system definitions.
-+	(let ((y (cadr x)))
-+         (mucs-define-coding-system
-+          (car x) (nth 1 y) (nth 2 y)
-+          (nth 3 y) (nth 4 y) (nth 5 y)))
-+      (mapcar
-+       (lambda (y)
-+        (mucs-define-coding-system
-+         (nth 0 y) (nth 1 y) (nth 2 y)
-+         (nth 3 y) (nth 4 y) (nth 5 y) (nth 6 y))
-+        (coding-system-put (car y) 'alias-coding-systems (list (car x)))))
-+      (cdr x)))
-   `((utf-8
-      (utf-8-unix
-       ?u "UTF-8 coding system"
-
-Note that Emacs has native support for Unicode, roughly equivalent to
-Mule-UCS's, so you may not need it.
-
-** Mule-UCS compilation problem.
-
-Emacs of old versions and XEmacs byte-compile the form `(progn progn
-...)' the same way as `(progn ...)', but Emacs of version 21.3 and the
-later process that form just as interpreter does, that is, as `progn'
-variable reference.  Apply the following patch to Mule-UCS 0.84 to
-make it compiled by the latest Emacs.
-
---- mucs-ccl.el	2 Sep 2005 00:42:23 -0000	1.1.1.1
-+++ mucs-ccl.el	2 Sep 2005 01:31:51 -0000	1.3
-@@ -639,10 +639,14 @@
-       (mucs-notify-embedment 'mucs-ccl-required name)
-       (setq ccl-pgm-list (cdr ccl-pgm-list)))
- ;   (message "MCCLREGFIN:%S" result)
--    `(progn
--       (setq mucs-ccl-facility-alist
--            (quote ,mucs-ccl-facility-alist))
--       ,@result)))
-+    ;; The only way the function is used in this package is included
-+    ;; in `mucs-package-definition-end-hook' value, where it must
-+    ;; return (possibly empty) *list* of forms.  Do this.  Do not rely
-+    ;; on byte compiler to remove extra `progn's in `(progn ...)'
-+    ;; form.
-+    `((setq mucs-ccl-facility-alist
-+           (quote ,mucs-ccl-facility-alist))
-+      ,@result)))
-
- ;;; Add hook for embedding translation informations to a package.
- (add-hook 'mucs-package-definition-end-hook
-
 ** Accented ISO-8859-1 characters are displayed as | or _.
 
 Try other font set sizes (S-mouse-1).  If the problem persists with