data transfer: use closesocket() when building from windows

- unfortunately, windows sockets are not file descriptors and
  are invalid parameters for close()

Change-Id: I3ff28af672718e6394f22f7df7f1d36d9b9cacb9

src/peer_connection.cpp

@@ -233,7 +233,11 @@ TcpSocketEndpoint::TcpSocketEndpoint(const IpAddr& addr)
 
 TcpSocketEndpoint::~TcpSocketEndpoint()
 {
+#ifndef _MSC_VER
     ::close(sock_);
+#else
+    ::closesocket(sock_);
+#endif
 }
 
 void