OCT 1. 修正高版本编译器报错问题

srcs/opendhcp183/opendhcpd.h

@@ -23,6 +23,8 @@
 ***************************************************************************/
 //This file defines all structures and constants
 //for both DHCP and DNS Servers
+#include <string>
+
 #define MAX_SERVERS       125
 #define MAX_DHCP_RANGES   125
 #define MAX_DNS_RANGES    32

srcs/vcpe_main.c

@@ -52,7 +52,9 @@ static void lwip_init_env() {
 
 cJSON *create_app_process_status(int isStart) {
     cJSON *pRspMsg = cJSON_CreateObject();
+#ifdef USED_USER_VNI
     cJSON_AddNumberToObject(pRspMsg, "vni", cfg_get_user_vni_id());
+#endif
     cJSON_AddStringToObject(pRspMsg, "process", isStart ? "setup" : "exit");
     return pRspMsg;
 }