Add function prototypes.

Add function prototypes.
(xm_update_label): Use val->name to look up
a label string from resources.
(all_dashes_p): Removed.
(make_menu_in_widget): Use lw_separator_p.  Set Motif separator
type.
(make_menu_in_widget): Set alignment of menu
title after all widgets have been created.
(xm_update_toggle): Add callback xm_generic_callback
instead of xm_internal_update_other_instances.
(make_menu_in_widget): Do help button before managing
children to get it to the right place.
(make_menu_in_widget): Create toggle buttons.
(update_one_menu_entry): Update toggle buttons.
(make_menu_in_widget): Test for menubar widgets
using XmNrowColumnType.