[ws2_32] in some cases send should block until the entire buffer is sent

[Damjan Jovanovic]

Changelog:
  * On Windows, with non-overlapped blocking stream sockets, send
should block until the entire buffer given to it is sent, or there is
an error. Added tests that prove this is the case and patched
WSASendTo to work correctly.

Damjan Jovanovic
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