Remove alternative K&R declarations.

Remove alternative K&R declarations.
* lwlib/lwlib.c (allocate_widget_instance, get_widget_info)
(get_widget_instance, find_instance, set_one_value)
(update_one_widget_instance, update_all_widget_values)
(lw_modify_all_widgets, lw_get_widget, lw_make_widget)
(lw_create_widget, lw_pop_all_widgets, lw_show_busy)
(lw_refigure_widget, lw_allow_resizing): Remove alternative K&R
declarations.
* lwlib/lwlib-Xlw.c (xlw_update_one_widget):
(xlw_pop_instance): Likewise.
* lwlib/lwlib-Xaw.c (xaw_update_one_widget, xaw_pop_instance):
Likewise.
* lwlib/lwlib-Xm.c (P_): Remove.

* src/xdisp.c (store_mode_line_noprop_char): Remove K&R alternative declaration.