Switch to go mod

vendor/github.com/fsouza/go-dockerclient/internal/archive/changes_unix.go

@@ -0,0 +1,16 @@
+// Copyright 2014 Docker authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the DOCKER-LICENSE file.
+
+// +build !windows
+
+package archive
+
+import (
+	"os"
+	"syscall"
+)
+
+func hasHardlinks(fi os.FileInfo) bool {
+	return fi.Sys().(*syscall.Stat_t).Nlink > 1
+}