[PATCH app-xcalc] Replace signal_t with void

[Alan Coopersmith]

On 12/17/13 08:33 AM, Gaetan Nadon wrote:
> Now that Imake SIGNALRETURNSINT has been removed, the signal handler
> function return type can only be void.
>
> Signed-off-by: Gaetan Nadon <memsize at videotron.ca>

Reviewed-by: Alan Coopersmith <alan.coopersmith at oracle.com>

-- 
	-Alan Coopersmith-              alan.coopersmith at oracle.com
	 Oracle Solaris Engineering - http://blogs.oracle.com/alanc