Use a windows specific keepalive function. (#1104)
Use a windows specific keepalive function. While it is possible to toggle `TCP_KEEPALIVE` in windows via setsockopt, you have to use `WSAIoctl` to set the interval. Since `WSAIoctl` can actually do all of this in one call (toggle the option, and set the corresponding interval), just use that in Windows and avoid the call to `setsockopt` alltogether. Fixes: #1100
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