ox-latex.el (org-latex-link): Escape `%' characters

* ox-latex.el (org-latex-link): Escape `%' characters.

lisp/ox-latex.el

@@ -1778,7 +1778,8 @@ DESC is the description part of the link, or the empty string.
 INFO is a plist holding contextual information.  See
 `org-export-data'."
   (let* ((type (org-element-property :type link))
-	 (raw-path (org-element-property :path link))
+	 (raw-path (replace-regexp-in-string
+		    "%" "\\%" (org-element-property :path link) nil t))
 	 ;; Ensure DESC really exists, or set it to nil.
 	 (desc (and (not (string= desc "")) desc))
 	 (imagep (org-export-inline-image-p