AP_RangeFinder: add override keyword where required

libraries/AP_RangeFinder/AP_RangeFinder_BBB_PRU.h

@@ -27,7 +27,7 @@ public:
     static bool detect();
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 

libraries/AP_RangeFinder/AP_RangeFinder_Benewake.h

@@ -23,7 +23,7 @@ public:
     static bool detect(AP_SerialManager &serial_manager, uint8_t serial_instance);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 

libraries/AP_RangeFinder/AP_RangeFinder_LeddarOne.h

@@ -50,7 +50,7 @@ public:
     static bool detect(AP_SerialManager &serial_manager, uint8_t serial_instance);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 

libraries/AP_RangeFinder/AP_RangeFinder_LightWareI2C.h

@@ -13,7 +13,7 @@ public:
                                           AP_HAL::OwnPtr<AP_HAL::I2CDevice> dev);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 

libraries/AP_RangeFinder/AP_RangeFinder_LightWareSerial.h

@@ -16,7 +16,7 @@ public:
     static bool detect(AP_SerialManager &serial_manager, uint8_t serial_instance);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 

libraries/AP_RangeFinder/AP_RangeFinder_MAVLink.h

@@ -17,10 +17,10 @@ public:
     static bool detect();
 
     // update state
-    void update(void);
+    void update(void) override;
 
     // Get update from mavlink
-    void handle_msg(mavlink_message_t *msg);
+    void handle_msg(mavlink_message_t *msg) override;
 
 protected:
 

libraries/AP_RangeFinder/AP_RangeFinder_MaxsonarI2CXL.h

@@ -15,7 +15,7 @@ public:
                                           AP_HAL::OwnPtr<AP_HAL::I2CDevice> dev);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 

libraries/AP_RangeFinder/AP_RangeFinder_MaxsonarSerialLV.h

@@ -16,7 +16,7 @@ public:
     static bool detect(AP_SerialManager &serial_manager, uint8_t serial_instance);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 

libraries/AP_RangeFinder/AP_RangeFinder_PWM.h

@@ -30,7 +30,7 @@ public:
     static bool detect();
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 

libraries/AP_RangeFinder/AP_RangeFinder_PX4_PWM.h

@@ -30,7 +30,7 @@ public:
     static bool detect();
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 

libraries/AP_RangeFinder/AP_RangeFinder_TeraRangerI2C.h

@@ -12,7 +12,7 @@ public:
                                           AP_HAL::OwnPtr<AP_HAL::I2CDevice> i2c_dev);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 

libraries/AP_RangeFinder/AP_RangeFinder_VL53L0X.h

@@ -12,7 +12,7 @@ public:
     static AP_RangeFinder_Backend *detect(RangeFinder::RangeFinder_State &_state, AP_HAL::OwnPtr<AP_HAL::I2CDevice> dev);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 

libraries/AP_RangeFinder/AP_RangeFinder_analog.h

@@ -13,7 +13,7 @@ public:
     static bool detect(RangeFinder::RangeFinder_State &_state);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 

libraries/AP_RangeFinder/AP_RangeFinder_uLanding.h

@@ -16,7 +16,7 @@ public:
     static bool detect(AP_SerialManager &serial_manager, uint8_t serial_instance);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected: