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/system/uart.h

@@ -23,9 +23,14 @@
 #ifndef __UART_H__
 #define __UART_H__
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 #include "fifo.h"
 #include "gpio.h"
-#include "stdio.h"
+
 /*!
  * UART peripheral ID
  */
@@ -183,4 +188,8 @@ uint8_t UartGetChar( Uart_t *obj, uint8_t *data );
  */
 uint8_t UartGetBuffer( Uart_t *obj, uint8_t *buffer, uint16_t size, uint16_t *nbReadBytes );
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // __UART_H__