[PATCH v4 0/1] MR21: include/guiddef.h: use Mingw64's __uuidof when present

[eric pouech (＠epo)]

otherwise Wine's and Mingw64's __uuidof() enter in conflict (C++)

Signed-off-by: Eric Pouech <eric.pouech(a)gmail.com>

--
  v4: include: Use Mingw64's __uuidof when present.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/21