[Bug 58302] winedmo deprecation warnings during compilation

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=58302

--- Comment #1 from Rafał Mużyło  ---
As the output clearly suggests, not only is that not a wine bug, but not a bug
in the first place.

As of ffmpeg 6.1.2 (the version I have, not necessarily one when the change was
made), the relevant portion of the header is like:

#if FF_API_OLD_CHANNEL_LAYOUT
...
    attribute_deprecated
    uint64_t channel_layout;
...
    attribute_deprecated
    int      channels;
#endif

At most the maintainer could consider porting to the new API (as hinted by
header comments), but perhaps they consider it too new.