conn: make binds replacable

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

main_windows.go

@@ -11,6 +11,7 @@ import (
 	"os/signal"
 	"syscall"
 
+	"golang.zx2c4.com/wireguard/conn"
 	"golang.zx2c4.com/wireguard/device"
 	"golang.zx2c4.com/wireguard/ipc"
 
@@ -47,7 +48,7 @@ func main() {
 		os.Exit(ExitSetupFailed)
 	}
 
-	device := device.NewDevice(tun, logger)
+	device := device.NewDevice(tun, conn.NewDefaultBind(), logger)
 	err = device.Up()
 	if err != nil {
 		logger.Errorf("Failed to bring up device: %v", err)