(add_setshow_cmd_full): Declare.
* cli/cli-decode.c (add_setshow_cmd): No longer static. Now
returns void. Use add_setshow_cmd_full.
(add_setshow_cmd_full): New function.
(add_setshow_auto_boolean_cmd): Use add_setshow_cmd_full.
(add_setshow_boolean_cmd): Likewise.