0.7.6.4:

0.7.6.4:
	SPARC fixups
	... make DB's wonderful stack exhaustion work on the SPARC
		adjust NPC logic
		add in fixup for bizarre SPARC calling convention
	... improve signal handling on SPARC/Linux
		make a distinction between interrupt_handle_now() as called
			from handlers, and interrupt_handle_now_handler()
			installed as the sa_sigaction bit.