update iotd 3rdlib build shell script for cjson

guowenxue

2021-05-02 aed475c7a57e329a3e90cce56d00ca997f519cda

 apue/2.Socket/socket_client.c

@@ -109,7 +109,8 @@
          }
       }

       //printf("Read %d bytes data from server: '%s'\n", rv, buf);

       sleep(5);
    }