Re: [PATCH v4 0/6] MR9150: comctl32: Remove v6 only exports.

[Nikolay Sivov (＠nsivov)]

Nikolay Sivov (@nsivov) commented about dlls/comctl32/commctrl.c:
>      UnregisterClassA(classes[i], NULL);
>
> #undef VERSION
> +#endif /* __WINE_COMCTL32_VERSION == 6 */
>  }

It's better to consolidate those checks as much as we can. For example unregister_versioned_class() does not have to exist for v5.