libnet: remove drivers_freebsd.go

As it stands, libnetwork pkg can't be compiled on FreeBSD, so no need to
keep this file around.

Signed-off-by: Albin Kerouanton <albinker@gmail.com>

daemon/libnetwork/drivers_freebsd.go

@@ -1,10 +0,0 @@
-package libnetwork
-
-import (
-	"github.com/moby/moby/v2/daemon/libnetwork/driverapi"
-	"github.com/moby/moby/v2/daemon/libnetwork/drivers/null"
-)
-
-func registerNetworkDrivers(r driverapi.Registerer, driverConfig func(string) map[string]any) error {
-	return null.Register(r)
-}

daemon/libnetwork/drivers_unsupported.go

@@ -1,4 +1,4 @@
-//go:build !freebsd && !linux && !windows
+//go:build !linux && !windows
 
 package libnetwork