[ws2_32] make closesocket cancel pending I/O operations

[Damjan Jovanovic]

On Windows, calling closesocket in one thread causes blocking I/O
operations on that socket (select, accept) running in other threads to
return immediately. On Linux, the I/O will block forever. Calling
shutdown as part of closesocket reproduces the same behaviour under
Linux. Closes #4619 and #3777.

Changelog:
  * Call shutdown as part of closesocket, so that blocking I/O
functions on that socket running in other threads return immediately.
Closes #4619 and #3777.
  * Added tests for the above behaviour.

Damjan Jovanovic
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