Removed support for OpenGL 2

Former-commit-id: e796c333d6c2ef0550ff4427d36dcfbaf00ef924

include/Nazara/Renderer/Texture.hpp

@@ -103,7 +103,6 @@ class NAZARA_API NzTexture : public NzAbstractImage, public NzRefCounted, public
 		// Fonctions OpenGL
 		unsigned int GetOpenGLID() const;
 
-		static unsigned int GetValidSize(unsigned int size);
 		static bool IsFormatSupported(nzPixelFormat format);
 		static bool IsMipmappingSupported();
 		static bool IsTypeSupported(nzImageType type);