[Vortex] async connect issue on linux 2.4

[Martin Huter]

hi.

found an issue in asyncronous connecting in __vortex_connection_new:
i couldn't figure out why, but it seems that - at least on linux 2.4 and older 
glibc versions - the select/poll after a non-blocking connect may (in very 
rare cases!) result a value >0 though the connection wasn't established at 
all.
i think it has something to do with the arp handling in the kernel, but i'm 
not sure.
anyway, querying the SO_ERROR option on the socket results an error in this 
case and one can find out that the connection is not established.
appended tiny patch queries that option in the __vortex_connection_new 
function, and it works for me.

cheers
martin huter

-- 
Martin Huter
Unit Manager
phion AG
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phion AG
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