(do_lookup, short_list, short_output, include_idle,

(do_lookup, short_list, short_output, include_idle,
include_heading, include_mesg, include_exit, need_boottime,
need_deadprocs, need_login, need_initspawn, need_clockchange,
need_runlevel, need_users, my_line_only, main): Use bool for booleans.
(print_runlevel): Use unsigned char for bytes.
(list_entries_who, scan_entries, who): Use size_t for sizes.
(main): No need to pass a non-NULL last arg to getopt_long.