[PATCH v5 0/1] MR7657: win32u: Store window styles in a DWORD (Coverity).

[Sven Baars (＠sbaars)]

`WS_POPUP` for instance is `0x80000000`, which overflows a `LONG`. Coverity complained about this. The return type of `get_window_long()` already was `DWORD`.

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  v5: win32u: Store window styles in a DWORD (Coverity).
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/7657