Add `Texinfo' entry to reftex-label-alist-builtin.

* lisp/textmodes/reftex-vars.el (reftex-label-alist-builtin): Add a
`Texinfo' entry.

lisp/ChangeLog

@@ -1,3 +1,8 @@
+2014-01-06  Tassilo Horn  <tsdh@gnu.org>
+
+	* textmodes/reftex-vars.el (reftex-label-alist-builtin): Add a
+	`Texinfo' entry.
+
 2014-01-06  Daniel Colascione  <dancol@dancol.org>
 
 	Fix defun navigation in vc log view.

lisp/textmodes/reftex-vars.el

@@ -127,7 +127,10 @@
 
       ;; The label macro is hard coded, but it *could* be defined like this:
       ;;("\\label{*}" nil nil nil nil)
-      )))
+      ))
+
+    ;; Texinfo
+    (Texinfo "Texinfo default environments" nil))
   "The default label environment descriptions.
 Lower-case symbols correspond to a style file of the same name in the LaTeX
 distribution.  Mixed-case symbols are convenience aliases.")