SITL: add missing override keywords

libraries/SITL/SIM_BalanceBot.h

@@ -27,7 +27,7 @@ public:
     BalanceBot(const char *home_str, const char *frame_str);
 
     /* update model by one time step */
-    void update(const struct sitl_input &input);
+    void update(const struct sitl_input &input) override;
 
     /* static object creator */
     static Aircraft *create(const char *home_str, const char *frame_str) {

libraries/SITL/SIM_Balloon.h

@@ -30,7 +30,7 @@ public:
     Balloon(const char *home_str, const char *frame_str);
 
     /* update model by one time step */
-    void update(const struct sitl_input &input);
+    void update(const struct sitl_input &input) override;
 
     /* static object creator */
     static Aircraft *create(const char *home_str, const char *frame_str) {

libraries/SITL/SIM_CRRCSim.h

@@ -32,7 +32,7 @@ public:
     CRRCSim(const char *home_str, const char *frame_str);
 
     /* update model by one time step */
-    void update(const struct sitl_input &input);
+    void update(const struct sitl_input &input) override;
 
     /* static object creator */
     static Aircraft *create(const char *home_str, const char *frame_str) {

libraries/SITL/SIM_Calibration.h

@@ -66,7 +66,7 @@ class Calibration : public Aircraft {
 public:
     Calibration(const char *home_str, const char *frame_str);
 
-    void update(const struct sitl_input &input);
+    void update(const struct sitl_input &input) override;
 
     static Aircraft *create(const char *home_str, const char *frame_str) {
         return new Calibration(home_str, frame_str);

libraries/SITL/SIM_FlightAxis.h

@@ -32,7 +32,7 @@ public:
     FlightAxis(const char *home_str, const char *frame_str);
 
     /* update model by one time step */
-    void update(const struct sitl_input &input);
+    void update(const struct sitl_input &input) override;
 
     /* static object creator */
     static Aircraft *create(const char *home_str, const char *frame_str) {

libraries/SITL/SIM_Gazebo.h

@@ -31,7 +31,7 @@ public:
     Gazebo(const char *home_str, const char *frame_str);
 
     /* update model by one time step */
-    void update(const struct sitl_input &input);
+    void update(const struct sitl_input &input) override;
 
     /* static object creator */
     static Aircraft *create(const char *home_str, const char *frame_str) {
@@ -39,7 +39,7 @@ public:
     }
 
     /*  Create and set in/out socket for Gazebo simulator */
-    void set_interface_ports(const char* address, const int port_in, const int port_out);
+    void set_interface_ports(const char* address, const int port_in, const int port_out) override;
 
 private:
     /*

libraries/SITL/SIM_Helicopter.h

@@ -30,7 +30,7 @@ public:
     Helicopter(const char *home_str, const char *frame_str);
 
     /* update model by one time step */
-    void update(const struct sitl_input &input);
+    void update(const struct sitl_input &input) override;
 
     /* static object creator */
     static Aircraft *create(const char *home_str, const char *frame_str) {

libraries/SITL/SIM_JSBSim.h

@@ -32,7 +32,7 @@ public:
     JSBSim(const char *home_str, const char *frame_str);
 
     /* update model by one time step */
-    void update(const struct sitl_input &input);
+    void update(const struct sitl_input &input) override;
 
     /* static object creator */
     static Aircraft *create(const char *home_str, const char *frame_str) {

libraries/SITL/SIM_Morse.h

@@ -31,7 +31,7 @@ public:
     Morse(const char *home_str, const char *frame_str);
 
     /* update model by one time step */
-    void update(const struct sitl_input &input);
+    void update(const struct sitl_input &input) override;
 
     /* static object creator */
     static Aircraft *create(const char *home_str, const char *frame_str) {

libraries/SITL/SIM_Multicopter.h

@@ -32,7 +32,7 @@ public:
     MultiCopter(const char *home_str, const char *frame_str);
 
     /* update model by one time step */
-    void update(const struct sitl_input &input);
+    void update(const struct sitl_input &input) override;
 
     /* static object creator */
     static Aircraft *create(const char *home_str, const char *frame_str) {

libraries/SITL/SIM_Plane.h

@@ -32,7 +32,7 @@ public:
     Plane(const char *home_str, const char *frame_str);
 
     /* update model by one time step */
-    virtual void update(const struct sitl_input &input);
+    virtual void update(const struct sitl_input &input) override;
 
     /* static object creator */
     static Aircraft *create(const char *home_str, const char *frame_str) {

libraries/SITL/SIM_Rover.h

@@ -30,7 +30,7 @@ public:
     SimRover(const char *home_str, const char *frame_str);
 
     /* update model by one time step */
-    void update(const struct sitl_input &input);
+    void update(const struct sitl_input &input) override;
 
     /* static object creator */
     static Aircraft *create(const char *home_str, const char *frame_str) {

libraries/SITL/SIM_Sailboat.h

@@ -30,7 +30,7 @@ public:
     Sailboat(const char *home_str, const char *frame_str);
 
     /* update model by one time step */
-    void update(const struct sitl_input &input);
+    void update(const struct sitl_input &input) override;
 
     /* static object creator */
     static Aircraft *create(const char *home_str, const char *frame_str) {

libraries/SITL/SIM_SingleCopter.h

@@ -31,7 +31,7 @@ public:
     SingleCopter(const char *home_str, const char *frame_str);
 
     /* update model by one time step */
-    void update(const struct sitl_input &input);
+    void update(const struct sitl_input &input) override;
 
     /* static object creator */
     static Aircraft *create(const char *home_str, const char *frame_str) {

libraries/SITL/SIM_Tracker.h

@@ -28,7 +28,7 @@ namespace SITL {
 class Tracker : public Aircraft {
 public:
     Tracker(const char *home_str, const char *frame_str);
-    void update(const struct sitl_input &input);
+    void update(const struct sitl_input &input) override;
 
     /* static object creator */
     static Aircraft *create(const char *home_str, const char *frame_str) {

libraries/SITL/SIM_XPlane.h

@@ -32,7 +32,7 @@ public:
     XPlane(const char *home_str, const char *frame_str);
 
     /* update model by one time step */
-    void update(const struct sitl_input &input);
+    void update(const struct sitl_input &input) override;
 
     /* static object creator */
     static Aircraft *create(const char *home_str, const char *frame_str) {

libraries/SITL/SIM_last_letter.h

@@ -32,7 +32,7 @@ public:
     last_letter(const char *home_str, const char *frame_str);
 
     /* update model by one time step */
-    void update(const struct sitl_input &input);
+    void update(const struct sitl_input &input) override;
 
     /* static object creator */
     static Aircraft *create(const char *home_str, const char *frame_str) {