0.8.3.68:

0.8.3.68:
	Kludge around an apparent problem in hardware/kernel/somewhere
	to do with denormalized float traps...
	... explicitly clear that bit in os_restore_fp_control();
	... document in BUGS;
	... handle ARITHMETIC-ERROR, not just DIVISION-BY-ZERO, so that
		ports without fp words in sigcontext pass the test