[PATCH v2 0/2] MR2055: win32u: Make more definitions hidden.

[Zebediah Figura (＠zfigura)]

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  v2: win32u: Make set_visible_region() hidden.
      win32u: Make send_message_timeout() hidden.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/2055