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/fifo.h

@@ -23,6 +23,11 @@
 #ifndef __FIFO_H__
 #define __FIFO_H__
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 #include <stdbool.h>
 #include <stdint.h>
 
@@ -85,4 +90,8 @@ bool IsFifoEmpty( Fifo_t *fifo );
  */
 bool IsFifoFull( Fifo_t *fifo );
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // __FIFO_H__