veyron/lib/netconfig: Fix build tag in ipaux_other.go.

Change-Id: I9ea49e078155c5c32562d459b105fef277757617
diff --git a/lib/netconfig/ipaux_other.go b/lib/netconfig/ipaux_other.go
index 5345a8f..23496f0 100644
--- a/lib/netconfig/ipaux_other.go
+++ b/lib/netconfig/ipaux_other.go
@@ -1,4 +1,4 @@
-// +build plan9 windows nacl
+// +build !linux,!bsd
 // TODO(bprosnitz) Should change for nacl?
 
 package netconfig