Remove unused local variable from all of the files.

Remove unused local variable from all of the files.

* liece-compat.el (liece-region-active-p): New function.
(liece-truncate-string-to-width): New function.

* liece-misc.el: Sort macrodefs.
(liece-maybe-poll): Abolish.

* liece-channel.el (liece-channel-last): Simplified.
(liece-channel-switch-to-last): Define as function.

* liece-commands.el (liece-command-ping): Send system-name until
liece-server-name is determined.

* liece-ctcp.el: Load `liece-q-*' even when compiling.

* liece-hilit.el (liece-highlight-turn-on-font-lock): Don't set
font-lock-support-mode if it isn't bound.