Drop non-portable libedit's el_data_set() and el_data_get() for

private data.

We can set/get private data with the documented el_get() and
el_set() so there's no need for our local extensions, which
never received much use anyway.

While here, also re-arrange the call to term_init_arrow. This
was left over from r89735 but is not required anymore.

This changes reduce differences against NetBSD's libedit.

MFC after:	2 months

lib/libedit/el.c

@@ -473,30 +473,6 @@ el_get(EditLine *el, int op, ...)
 	return (rv);
 }
 
-/* el_data_get():
- *	Set user private data.
- */
-public void
-el_data_set (el, data)
-    EditLine *el;
-    void *data;
-{
-    el->el_data = data;
-
-    return;
-}
-
-/* el_data_get():
- *	Return user private data.
- */
-public void *
-el_data_get (el)
-    EditLine *el;
-{
-    if (el->el_data)
-	return (el->el_data);
-    return (NULL);
-}
 
 /* el_line():
  *	Return editing info

lib/libedit/histedit.h

@@ -154,13 +154,6 @@ int		el_source(EditLine *, const char *);
  */
 void		 el_resize(EditLine *);
 
-
-/*
- * Set user private data.
- */
-void            el_data_set(EditLine *, void *);
-void *          el_data_get(EditLine *);
-
 /*
  * User-defined function interface.
  */

lib/libedit/term.c

@@ -340,8 +340,8 @@ term_init(EditLine *el)
 	if (el->el_term.t_val == NULL)
 		return (-1);
 	(void) memset(el->el_term.t_val, 0, T_val * sizeof(int));
-	term_init_arrow(el);
 	(void) term_set(el, NULL);
+	term_init_arrow(el);
 	return (0);
 }