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/nvmm.h

@@ -33,6 +33,11 @@
 #ifndef __NVMM_H__
 #define __NVMM_H__
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 #include <stdlib.h>
 #include <stdint.h>
 
@@ -112,4 +117,8 @@ NvmmStatus_t NvmmWrite( NvmmDataBlock_t* dataB, void* src, size_t num );
  */
 NvmmStatus_t NvmmRead( NvmmDataBlock_t* dataB, void* dst, size_t num );
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // __NVMM_H__