[patch] implement multiple-value-or

Hi there,

I just stumbled over the lack of a multiple-value-or in CL, so here's  
a patch hat implement it in alexandria (with the first value  
specifying which value's non-NIL-ness to consider):

It may look horrifying, but it allows pleasant things like:

(multiple-value-or 1 (gethash key table) (gethash key alternative- 
table))

and other niceties.

Hope you like it,
--

-- 
Andreas Fuchs, (http://|im:asf <at> |mailto:asf <at> )boinkor.net, antifuchs

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