Do not format sub- and superscripts in links

* lisp/org.el (org-raise-scripts): Do not act in links.

Matt Lundin writes:

> Git commit 70d24c5d036cd5787f719104a0ad2f157c5207b1 causes underscores
> in hyperlinks to display parts of link and description as subscripts.
> E.g., this link...
>
> [[http://www.samplepage.com/an_underscore][Some description words]]
>
> ...displays the word "Some" in the description as a subscript. With M-x
> visible-mode, the substring "underscore][Some" is displayed as a
> subscript.

lisp/org.el

@@ -5513,13 +5513,14 @@ and subscriipts."
 	     org-match-substring-regexp
 	   org-match-substring-with-braces-regexp)
 	 limit t)
-	(let* ((pos (point)) table-p comment-p emph-p)
+	(let* ((pos (point)) table-p comment-p emph-p link-p)
 	  (setq emph-p (get-text-property (match-beginning 3) 'org-emphasis))
+	  (setq link-p (get-text-property (match-beginning 3) 'mouse-face))
 	  (goto-char (point-at-bol))
 	  (setq table-p (org-looking-at-p org-table-dataline-regexp)
 		comment-p (org-looking-at-p "[ \t]*#"))
 	  (goto-char pos)
-	  (if (or comment-p emph-p)
+	  (if (or comment-p emph-p link-p)
 	      t
 	    (put-text-property (match-beginning 3) (match-end 0)
 			       'display