[PATCH] ICC fixes

I have now committed the trivial const-correctness and signed/unsigned
fixes required to build trunk on ICC.

There are however some issues which involve logic changes and thus a
second pair of eyes to audit.

The attached patch alters the DNS lookup behaviour to abort with an
error in ALL cases where the rfc1035 library generates an error
(negative result).

   I'm not sure there is any noticable effect other than better code.
The error case *should* in old code be picked up on the initial packet
construction rather than the repeat packet. This may be incorrect given
that the packet type is changing between A/AAAA.

Can someone please check over this fixes and verify that I am not
breaking anything?

Amos

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