fix: update method declarations to match base class and resolve errors

Author: revmischa

src/libprojectM/Renderer/Backend/OpenGL/OpenGLCopyTexture.hpp

@@ -14,9 +14,9 @@ class OpenGLCopyTexture : public CopyTexture, public OpenGLRenderItem
 {
 public:
     OpenGLCopyTexture();
-    ~OpenGLCopyTexture() override = default;
+    ~OpenGLCopyTexture() = default;
 
-    void InitVertexAttrib() override;
+    void InitVertexAttrib();
 
     void Draw(const std::shared_ptr<class Texture>& originalTexture,
               bool flipVertical = false, bool flipHorizontal = false) override;

src/libprojectM/Renderer/Backend/OpenGL/OpenGLRenderItem.hpp

@@ -12,12 +12,12 @@ class OpenGLRenderItem : public libprojectM::Renderer::RenderItem
 {
 public:
     OpenGLRenderItem();
-    ~OpenGLRenderItem();
+    virtual ~OpenGLRenderItem();
 
-    void InitVertexAttrib();
+    virtual void InitVertexAttrib();
 
     // Override Init to provide OpenGL-specific initialization
-    void Init();
+    virtual void Init();
 
 protected:
     GLuint m_vboID{0};