Don't use virtual when reimplementing virtual function.

src/Camera.h

@@ -119,7 +119,7 @@ class MAGNUM_EXPORT Camera: public Object {
         /**
          * Recalculates camera matrix.
          */
-        virtual void setClean();
+        void setClean();
 
     private:
         Matrix4 rawProjectionMatrix;

src/IndexedMesh.h

@@ -74,7 +74,7 @@ class MAGNUM_EXPORT IndexedMesh: public Mesh {
          * Binds attributes to buffers, bind index buffer and draws the mesh.
          * Expects an active shader with all uniforms set.
          */
-        virtual void draw();
+        void draw();
 
     private:
         Buffer _indexBuffer;

src/Light.h

@@ -47,7 +47,7 @@ class Light: public Object {
         /**
          * Recomputes light position.
          */
-        virtual void setClean();
+        void setClean();
 
     private:
         Vector3 _position;