Remove bogus ":safe nil" custom properties

* lisp/org/oc.el (org-cite-activate-processor)
(org-cite-export-processors, org-cite-follow-processor)
(org-cite-insert-processor):
* lisp/org/ol.el (org-link-parameters, org-link-frame-setup)
(org-link-shell-confirm-function)
(org-link-shell-skip-confirm-regexp)
(org-link-elisp-confirm-function)
(org-link-elisp-skip-confirm-regexp):
* lisp/org/org-num.el (org-num-format-function):
Remove bogus ":safe nil" that do nothing but propagate a
misunderstanding of the safe-local-variable property.

lisp/org/oc.el

@@ -135,8 +135,7 @@ File names must be absolute."
   :group 'org-cite
   :package-version '(Org . "9.5")
   :type '(choice (const :tag "Default fontification" nil)
-                 (symbol :tag "Citation processor"))
-  :safe nil)
+                 (symbol :tag "Citation processor")))
 
 (defcustom org-cite-export-processors '((t basic))
   "Processor used for exporting citations, as a triplet, or nil.
@@ -200,24 +199,21 @@ back-end."
                                (string :tag "Use specific bibliography style"))
                               (choice
                                (const :tag "Default citation style" nil)
-                               (string :tag "Use specific citation style")))))
-  :safe nil)
+                               (string :tag "Use specific citation style"))))))
 
 (defcustom org-cite-follow-processor 'basic
   "Processor used for following citations, as a symbol."
   :group 'org-cite
   :package-version '(Org . "9.5")
   :type '(choice (const :tag "No following" nil)
-                 (symbol :tag "Citation processor"))
-  :safe nil)
+                 (symbol :tag "Citation processor")))
 
 (defcustom org-cite-insert-processor 'basic
   "Processor used for inserting citations, as a symbol."
   :group 'org-cite
   :package-version '(Org . "9.5")
   :type '(choice (const :tag "No insertion" nil)
-                 (symbol :tag "Citation processor"))
-  :safe nil)
+                 (symbol :tag "Citation processor")))
 
 (defcustom org-cite-adjust-note-numbers t
   "When non-nil, allow process to modify location of note numbers.

lisp/org/ol.el

@@ -178,8 +178,7 @@ link.
   :group 'org-link
   :package-version '(Org . "9.1")
   :type '(alist :tag "Link display parameters"
-		:value-type plist)
-  :safe nil)
+		:value-type plist))
 
 (defcustom org-link-descriptive t
   "Non-nil means Org displays descriptive links.
@@ -335,8 +334,7 @@ another window."
 	  (cons (const wl)
 		(choice
 		 (const wl)
-		 (const wl-other-frame))))
-  :safe nil)
+		 (const wl-other-frame)))))
 
 (defcustom org-link-search-must-match-exact-headline 'query-to-create
   "Non-nil means internal fuzzy links can only match headlines.
@@ -385,15 +383,13 @@ single keystroke rather than having to type \"yes\"."
   :type '(choice
 	  (const :tag "with yes-or-no (safer)" yes-or-no-p)
 	  (const :tag "with y-or-n (faster)" y-or-n-p)
-	  (const :tag "no confirmation (dangerous)" nil))
-  :safe nil)
+	  (const :tag "no confirmation (dangerous)" nil)))
 
 (defcustom org-link-shell-skip-confirm-regexp ""
   "Regexp to skip confirmation for shell links."
   :group 'org-link-follow
   :version "24.1"
-  :type 'regexp
-  :safe nil)
+  :type 'regexp)
 
 (defcustom org-link-elisp-confirm-function 'yes-or-no-p
   "Non-nil means ask for confirmation before executing Emacs Lisp links.
@@ -410,15 +406,13 @@ single keystroke rather than having to type \"yes\"."
   :type '(choice
 	  (const :tag "with yes-or-no (safer)" yes-or-no-p)
 	  (const :tag "with y-or-n (faster)" y-or-n-p)
-	  (const :tag "no confirmation (dangerous)" nil))
-  :safe nil)
+	  (const :tag "no confirmation (dangerous)" nil)))
 
 (defcustom org-link-elisp-skip-confirm-regexp ""
   "A regexp to skip confirmation for Elisp links."
   :group 'org-link-follow
   :version "24.1"
-  :type 'regexp
-  :safe nil)
+  :type 'regexp)
 
 (defgroup org-link-store nil
   "Options concerning storing links in Org mode."

lisp/org/org-num.el

@@ -99,8 +99,7 @@ Any `face' text property on the returned string overrides
 `org-num-face'."
   :group 'org-appearance
   :package-version '(Org . "9.3")
-  :type 'function
-  :safe nil)
+  :type 'function)
 
 (defcustom org-num-max-level nil
   "Level below which headlines are not numbered.