net: fix linux build
net: fix linux build

R=golang-dev, bradfitz
CC=golang-dev
http://codereview.appspot.com/5558056

Committer: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go