ugen.c hack for iso writes

[Mathew Kanner]

Hi,
	The attached patch allows me to roughly play sound on my Sound
Blaster SB0270.  I can't get uaudio to work with it but at least I can
play something now using ugen.
	The patch changes the probing routine to be more forgiving
about failure when looking for endpoints and makes it also consider
alternative interfaces.  It also add ISO writes to some degree.
	I get the occasional panic with it so beware, I'm posting here
so it doesn't get lost.
	--Mat
ps. CC me, I'm not subscribed
-- 
	I have found that humans often use Smalltalk
	during awkward moments. ("Data")
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