Re: [PATCH 0/4] MR5436: win32u: Replace sprintf with snprintf to avoid deprecation warnings on macOS.

[Rémi Bernon]

```suggestion:-0+0
        len = strlen( buf );
```

Fwiw IMO the strcat would be worth replacing with `snprintf` too, and the buffer size here feels a bit short, i don't see an easy way to make it 100% safe but maybe making it larger would be better.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/5436#note_66625