gofmt error in v5.36.0 during brew build

[andig]

2021-07-26T19:20:28.5151160Z --- /private/tmp/mmctl-20210726-5071-141gaja/src/github.com/mattermost/mmctl/commands/utils_unix.go.orig	2021-07-26 12:20:18.000000000 -0700
2021-07-26T19:20:28.5153150Z +++ /private/tmp/mmctl-20210726-5071-141gaja/src/github.com/mattermost/mmctl/commands/utils_unix.go	2021-07-26 12:20:18.000000000 -0700
2021-07-26T19:20:28.5154400Z @@ -1,6 +1,7 @@
2021-07-26T19:20:28.5155460Z  // Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
2021-07-26T19:20:28.5156460Z  // See LICENSE.txt for license information.
2021-07-26T19:20:28.5157100Z  
2021-07-26T19:20:28.5157560Z +//go:build linux || darwin
2021-07-26T19:20:28.5158100Z  // +build linux darwin
2021-07-26T19:20:28.5158570Z  
2021-07-26T19:20:28.5159020Z  package commands