Introduce grub_efi_packed_guid and use it where alignment is not

guaranteed.

grub-core/commands/efi/lsefi.c

@@ -95,7 +95,7 @@ grub_cmd_lsefi (grub_command_t cmd __attribute__ ((unused)),
       grub_efi_handle_t handle = handles[i];
       grub_efi_status_t status;
       grub_efi_uintn_t num_protocols;
-      grub_efi_guid_t **protocols;
+      grub_efi_packed_guid_t **protocols;
       grub_efi_device_path_t *dp;
 
       grub_printf ("Handle %p\n", handle);