effort to have no warnings once again

src/rendering/twn_draw_c.h

@@ -194,6 +194,8 @@ void use_2d_pipeline(void);
 
 void use_texture_mode(TextureMode mode);
 
+void upload_quad_vertices(Rect rect);
+
 void finally_render_sprites(Primitive2D const primitives[],
                             struct SpriteBatch batch,
                             VertexBuffer buffer);