RFC: remove SIGWINCH_HANDLER and SIGWINCH_HANDLER_BODY

[Mark Kettenis]

> From: Tom Tromey <tromey@redhat.com>
> Date: Wed, 15 Aug 2012 09:35:41 -0600
> 
> As far as I can tell, nothing ever defines SIGWINCH_HANDLER or
> SIGWINCH_HANDLER_BODY, so the code referring to it is dead.
>     
> Tested by rebuilding and also grepping to make sure that it isn't
> defined somewhere.  I also checked Insight.
> 
> Tom
> 
>     	* event-top.c (sigwinch_token, handle_sigwinch): Remove.
>     	(async_init_signals): Update.
>     	* utils.c (init_page_info): Don't use SIGWINCH_HANDLER.
>     	(SIGWINCH_HANDLER_BODY): Remove.

Great!