mbedtls: handle WSAEWOULDBLOCK in net_send on Windows#3619
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On Windows LWS_ERRNO is WSAGetLastError(), so a full socket send buffer reports WSAEWOULDBLOCK (10035), not the CRT EWOULDBLOCK. lws_plat_mbedtls_net_send only matched EAGAIN/EWOULDBLOCK, so a backed-up send (e.g. a large HTTP/2 request body upload, where the loopback/peer send buffer fills) was misreported as a fatal MBEDTLS_ERR_NET_SEND_FAILED rather than a retryable WANT_WRITE, tearing down the connection. The sibling lws_plat_mbedtls_net_recv already checks WSAEWOULDBLOCK; mirror it in net_send.
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On Windows LWS_ERRNO is WSAGetLastError(), so a full socket send buffer
reports WSAEWOULDBLOCK (10035), not the CRT EWOULDBLOCK. lws_plat_mbedtls_net_send
only matched EAGAIN/EWOULDBLOCK, so a backed-up send (e.g. a large HTTP/2 request
body upload, where the loopback/peer send buffer fills) was misreported as a fatal
MBEDTLS_ERR_NET_SEND_FAILED rather than a retryable WANT_WRITE, tearing down the
connection. The sibling lws_plat_mbedtls_net_recv already checks WSAEWOULDBLOCK;
mirror it in net_send.