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>

internal/pkg/pkg_test.go

@@ -25,6 +25,7 @@ import (
 	"hakurei.app/container"
 	"hakurei.app/fhs"
 	"hakurei.app/internal/info"
+	"hakurei.app/internal/landlock"
 	"hakurei.app/internal/pkg"
 	"hakurei.app/internal/stub"
 	"hakurei.app/message"
@@ -293,7 +294,7 @@ func checkWithCache(t *testing.T, testCases []cacheTestCase) {
 			flags := tc.flags
 
 			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)
 					}