[Nickle] SIGINT fails to raise an exception

[Carl Worth]

Here's a simple-enough program:

	twixt (printf ("Thanks, "); printf ("I needed that\n") )
	{
	    while (true)
	        sleep (1000);
	}

that currently fails. It appears that giving a nickle responds to
SIGINT by simply printing "<abort>" and exiting rather than raising an
exception so that my twixt can handle things the way it wants to.

-Carl
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