Support priv/unpriv image extraction

Optionally add back privileged extraction which can be enabled with
LUET_PRIVILEGED_EXTRACT=true

Signed-off-by: Ettore Di Giacinto <mudler@sabayon.org>

vendor/github.com/moby/buildkit/util/appdefaults/appdefaults_windows.go

@@ -0,0 +1,31 @@
+package appdefaults
+
+import (
+	"os"
+	"path/filepath"
+)
+
+const (
+	Address = "npipe:////./pipe/buildkitd"
+)
+
+var (
+	Root      = filepath.Join(os.Getenv("ProgramData"), "buildkitd", ".buildstate")
+	ConfigDir = filepath.Join(os.Getenv("ProgramData"), "buildkitd")
+)
+
+func UserAddress() string {
+	return Address
+}
+
+func EnsureUserAddressDir() error {
+	return nil
+}
+
+func UserRoot() string {
+	return Root
+}
+
+func UserConfigDir() string {
+	return ConfigDir
+}