libct/seccomp/patchbpf: use binary.NativeEndian

It is available since Go 1.21 and is defined during compile time
(i.e. based on GOARCH during build).

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

libcontainer/utils/utils.go

@@ -1,13 +1,11 @@
 package utils
 
 import (
-	"encoding/binary"
 	"encoding/json"
 	"io"
 	"os"
 	"path/filepath"
 	"strings"
-	"unsafe"
 
 	"golang.org/x/sys/unix"
 )
@@ -16,20 +14,6 @@ const (
 	exitSignalOffset = 128
 )
 
-// NativeEndian is the native byte order of the host system.
-var NativeEndian binary.ByteOrder
-
-func init() {
-	// Copied from <golang.org/x/net/internal/socket/sys.go>.
-	i := uint32(1)
-	b := (*[4]byte)(unsafe.Pointer(&i))
-	if b[0] == 1 {
-		NativeEndian = binary.LittleEndian
-	} else {
-		NativeEndian = binary.BigEndian
-	}
-}
-
 // ExitStatus returns the correct exit status for a process based on if it
 // was signaled or exited cleanly
 func ExitStatus(status unix.WaitStatus) int {