Update LoRaMac-node to Version 4.4.4，fix Security breach found by Tencent Blade Team please refer to security advisory - CVE-2020-11068

fix Security breach found by Tencent Blade Team please refer to security advisory - CVE-2020-11068

components/connectivity/LoraWAN/boards_common/uart-usb-board.h

@@ -23,6 +23,11 @@
 #ifndef __UART_USB_BOARD_H__
 #define __UART_USB_BOARD_H__
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 #include <stdint.h>
 #include "uart.h"
 
@@ -90,4 +95,8 @@ uint8_t UartUsbPutChar( Uart_t *obj, uint8_t data );
  */
 uint8_t UartUsbGetChar( Uart_t *obj, uint8_t *data );
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // __UART_USB_BOARD_H__