Re: [PATCH v2 0/5] MR6490: winsock: Avoid short writes on nonblocking sockets.

[Jinoh Kang (＠iamahuman)]

Now that we have a flag for indicating system asyncs, I suppose we should also disable `set_fd_signaled()` for these asyncs. Might be trivial, but otherwise this subtle deviation of behavior from Windows has no FIXME and thus harder to debug.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/6490#note_82185