made mac_nr and rrc_nr final to avoid using virtual dtors

srsue/hdr/stack/mac/mac_nr.h

@@ -36,7 +36,7 @@ struct mac_nr_args_t {
   srsue::pcap_args_t pcap;
 };
 
-class mac_nr : public mac_interface_phy_nr, public mac_interface_rrc_nr
+class mac_nr final : public mac_interface_phy_nr, public mac_interface_rrc_nr
 {
 public:
   mac_nr();

srsue/hdr/stack/rrc/rrc_nr.h

@@ -47,10 +47,10 @@ struct rrc_nr_args_t {
 
 struct rrc_nr_metrics_t {};
 
-class rrc_nr : public rrc_interface_phy_nr,
-               public rrc_interface_pdcp,
-               public rrc_interface_rlc,
-               public srslte::timer_callback
+class rrc_nr final : public rrc_interface_phy_nr,
+                     public rrc_interface_pdcp,
+                     public rrc_interface_rlc,
+                     public srslte::timer_callback
 {
 public:
   rrc_nr();