fix non-final sdap/mac/rlc dtor error

srsenb/hdr/stack/mac/mac_nr.h

@@ -45,7 +45,7 @@ struct mac_nr_args_t {
   uint32_t    tb_size = 64;
 };
 
-class mac_nr : public mac_interface_phy_nr, public mac_interface_rrc_nr, public mac_interface_rlc_nr
+class mac_nr final : public mac_interface_phy_nr, public mac_interface_rrc_nr, public mac_interface_rlc_nr
 {
 public:
   mac_nr();

srsenb/hdr/stack/upper/rlc_nr.h

@@ -38,7 +38,7 @@ typedef struct {
   uint8_t* payload;
 } mch_service_t;
 
-class rlc_nr : public rlc_interface_mac_nr, public rlc_interface_rrc_nr, public rlc_interface_pdcp_nr
+class rlc_nr final : public rlc_interface_mac_nr, public rlc_interface_rrc_nr, public rlc_interface_pdcp_nr
 {
 public:
   explicit rlc_nr(const char* logname);

srsenb/hdr/stack/upper/sdap.h

@@ -29,7 +29,7 @@
 
 namespace srsenb {
 
-class sdap : public sdap_interface_pdcp_nr, public sdap_interface_gtpu_nr
+class sdap final : public sdap_interface_pdcp_nr, public sdap_interface_gtpu_nr
 {
 public:
   explicit sdap();