Added include for sprintf

AlexeyAB

2018-03-12 15c89e7a714e7e37c13618eace9325a06f0642fc

 src/demo.c

@@ -233,7 +233,7 @@
            }

         // if you run it with param -http_port 8090  then open URL in your web-browser: http://localhost:8090
         if (http_stream_port > 0) {
         if (http_stream_port > 0 && show_img) {
            //int port = 8090;
            int port = http_stream_port;
            int timeout = 200;
@@ -242,10 +242,11 @@
         }

         // save video file
         if (output_video_writer) {
         if (output_video_writer && show_img) {
            cvWriteFrame(output_video_writer, show_img);
            printf("\n cvWriteFrame \n");
         }

         cvReleaseImage(&show_img);

            pthread_join(fetch_thread, 0);