[PATCH 0/5] MR3284: win32u: Always use NtCallbackReturn to return result from client callbacks.

[Jacek Caban (＠jacek)]

We needed an alternative mechanism for cases when we couldn't assume that we're running on Unix stack. It's no longer needed, so we can get rid of it now.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/3284