network: fix win32 errno usage with poll

• poll(), vlc_poll() and vlc_poll_i11e() set errno, not net_errno
• handle more error codes

Extracted from !2155 (closed)

changed milestone to %4.0

added Platform::Windows desktop label

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added 17 commits

• b6f8ab85...4ced8ba1 - 15 commits from branch videolan:master
• 675ff909 - win32: add more winsock errors
• a81ac86b - network: don't use net_errno to log poll() errors

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enabled an automatic merge when the pipeline for a81ac86b succeeds

merged