internal/landlock: relocate from package container

This is not possible to use directly, so remove it from the public API.

Signed-off-by: Ophestra <cat@gensokyo.uk>

container/container_test.go

@@ -26,6 +26,7 @@ import (
 	"hakurei.app/fhs"
 	"hakurei.app/hst"
 	"hakurei.app/internal/info"
+	"hakurei.app/internal/landlock"
 	"hakurei.app/internal/params"
 	"hakurei.app/ldd"
 	"hakurei.app/message"
@@ -456,7 +457,7 @@ func TestContainer(t *testing.T) {
 			c.RetainSession = tc.session
 			c.HostNet = tc.net
 			if info.CanDegrade {
-				if _, err := container.LandlockGetABI(); err != nil {
+				if _, err := landlock.GetABI(); err != nil {
 					if !errors.Is(err, syscall.ENOSYS) {
 						t.Fatalf("LandlockGetABI: error = %v", err)
 					}