pkg/idtools: remove uses of deprecated system.MkdirAll

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

pkg/idtools/idtools_windows.go

@@ -2,8 +2,6 @@ package idtools // import "github.com/docker/docker/pkg/idtools"
 
 import (
 	"os"
-
-	"github.com/docker/docker/pkg/system"
 )
 
 const (
@@ -15,10 +13,10 @@ const (
 	ContainerUserSidString          = "S-1-5-93-2-2"
 )
 
-// This is currently a wrapper around MkdirAll, however, since currently
+// This is currently a wrapper around [os.MkdirAll] since currently
 // permissions aren't set through this path, the identity isn't utilized.
 // Ownership is handled elsewhere, but in the future could be support here
 // too.
 func mkdirAs(path string, _ os.FileMode, _ Identity, _, _ bool) error {
-	return system.MkdirAll(path, 0)
+	return os.MkdirAll(path, 0)
 }