[XAM/Net] Added unified method of returning WSA error codes

src/xenia/kernel/xsocket.cc

@@ -269,5 +269,14 @@ X_STATUS XSocket::GetSockName(uint8_t* buf, int* buf_len) {
   return X_STATUS_SUCCESS;
 }
 
+uint32_t XSocket::GetLastWSAError() const {
+  // Todo(Gliniak): Provide error mapping table
+  // Xbox error codes might not match with what we receive from OS
+#ifdef XE_PLATFORM_WIN32
+  return WSAGetLastError();
+#endif
+  return errno;
+}
+
 }  // namespace kernel
 }  // namespace xe