Backport commit 6b2219cd2 from Emacs

* lisp/org.el (org-read-date-analyze):
* lisp/ox-html.el (org-html-latex-fragment):
Add several "duplicate value in `cond`" FIXMEs.
Found by Mattias Engdegård <mattias.engdegard@gmail.com>.
Ref: https://debbugs.gnu.org/51368#51

; Add several "duplicate value in `cond`" FIXMEs
6b2219cd2744c711580cc7226554e69c8cec8247
Stefan Kangas
Sun Oct 1 19:00:26 2023 +0200

lisp/org.el

@@ -14035,6 +14035,7 @@ user."
       (unless deltadef
 	(let ((now (decode-time)))
 	  (setq day (nth 3 now) month (nth 4 now) year (nth 5 now))))
+      ;; FIXME: Duplicated value in ‘cond’: ""
       (cond ((member deltaw '("h" ""))
              (when (boundp 'org-time-was-given)
                (setq org-time-was-given t))

lisp/ox-html.el

@@ -3094,6 +3094,7 @@ CONTENTS is nil.  INFO is a plist holding contextual information."
   (let ((latex-frag (org-element-property :value latex-fragment))
 	(processing-type (plist-get info :with-latex)))
     (cond
+     ;; FIXME: Duplicated value in ‘cond’: t
      ((memq processing-type '(t mathjax))
       (org-html-format-latex latex-frag 'mathjax info))
      ((memq processing-type '(t html))