Add the correct definition for ECONNREFUSED for Windows

src/PlatformSockets.h

@@ -18,6 +18,7 @@
 #define EINPROGRESS WSAEINPROGRESS
 #define EINTR WSAEINTR
 #define ETIMEDOUT WSAETIMEDOUT
+#define ECONNREFUSED WSAECONNREFUSED
 
 typedef int SOCK_RET;
 typedef int SOCKADDR_LEN;