Add const to array elements.

Add const to array elements.

* keyboard.c (modify_event_symbol) : Add const to array elements of arg NAME_TABLE.
(lispy_accent_keys, lispy_function_keys, lispy_multimedia_keys)
(lispy_kana_keys, iso_lispy_function_keys, lispy_wheel_names)
(lispy_wheel_names, lispy_drag_n_drop_names, modifier_names):
Add const to array elements.
(scroll_bar_parts): Make static.  Fix position of const.

* w32fns.c (lispy_function_keys): Add const to extern.

* w32inevt.c (lispy_function_keys): Likewise.