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/display-board.h

@@ -28,6 +28,11 @@
 #ifndef __DISPLAY_BOARD_H__
 #define __DISPLAY_BOARD_H__
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 #include <stdint.h>
 #include <stdbool.h>
 
@@ -290,4 +295,8 @@ void DisplayPrint( const char *string );
  */
 void DisplayPrintf( const char *format, ... );
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // __DISPLAY_BOARD_H__