is somewhat stricter.
(is_wday_allowed, is_daytime_allowed, is_daytime_nar,
min_to_next_daytime): New.
(demand_update_time, scheduled_update_time, next_scheduled_time,
update_time, gamehours): Use them to replace kw_parse().
(kw_parse): No longer used, remove.
thread entrypoints:
(lwpSelect, shutdown_sequence): Parameters didn't match thread entry
point prototype.
(lwpEntryPoint): Arguments didn't match thread entry point prototype.
Change linkage of functions without prototype declaration to static
where possible.
Remove some superflous declarations, replace others by suitable
includes.
