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/gpio.h

@@ -27,6 +27,11 @@
 #ifndef __GPIO_H__
 #define __GPIO_H__
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 #include <stdint.h>
 #include "pinName-board.h"
 #include "pinName-ioe.h"
@@ -179,4 +184,8 @@ void GpioToggle( Gpio_t *obj );
  */
 uint32_t GpioRead( Gpio_t *obj );
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // __GPIO_H__