Missing network-uri dependency (?)

I found that http-streams didn't compile without me adding a network-uri dependency when using a ghc 7.8. 
This might be just re-organization of various packages, so it might need an ifdef to work on older ghc's. I don't have an one handy, so I can't test it right now.

(ie. "I don't really know what I'm doing but heres a patch which makes stuff compile")