[PATCH] Print a more friendly message when http_proxy is down.

[Nikita Karetnikov]

> Perhaps it's better to solve this in HTTP itself?

I think so.

> cabal: openTCPConnection: host lookup failure for "foo"

What version of network is it?  I ran ‘grep -r “host lookup failure”’ on
the source of 2.5.0.0 and didn’t find anything.
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