Overwatch 2 verifies that every kernel callback that is run, lives in user32. Introduce a callback in user32 that just forwards to the other modules' callbacks.
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v11: user32: Remove NtUserDriverCallback* kernel callbacks.
winex11.drv: Route kernel callbacks through user32.
winex11.drv: Pass a struct to x11drv_ime_set_result.
winex11.drv: Pass a struct to x11drv_dnd_post_drop.
winemac.drv: Route kernel callbacks through user32.
https://gitlab.winehq.org/wine/wine/-/merge_requests/1180