Fix const cc algo

Author: huitema

picoquictest/picoquic_ns.c

@@ -101,7 +101,7 @@
 typedef struct st_picoquic_ns_client_t {
     uint64_t start_time;
     picoquic_cnx_t* cnx;
-    picoquic_congestion_algorithm_t* cc_algo;
+    picoquic_congestion_algorithm_t const* cc_algo;
     char const* cc_option_string;
     quicperf_ctx_t* quicperf_ctx;
     picoquic_connection_id_t icid;

picoquictest/picoquic_ns.h

@@ -61,9 +61,9 @@ typedef struct st_picoquic_ns_spec_t {
     uint64_t background_start_time;
     const char* main_scenario_text;
     const char* background_scenario_text;
-    picoquic_congestion_algorithm_t* main_cc_algo;
+    picoquic_congestion_algorithm_t const* main_cc_algo;
     char const* main_cc_options;
-    picoquic_congestion_algorithm_t* background_cc_algo;
+    picoquic_congestion_algorithm_t const* background_cc_algo;
     char const* background_cc_options;
     int nb_connections;
     double data_rate_in_gbps; /* datarate, server to clients, defaults to 10 mbps */