bug#54973: Blender has no denoiser

[Haider Mirza]

Blender in Guix has no denoiser, as Blender is not compiled with 
OpenImageDenoise or so Blender tells me.
Therefore, the denoiser just renders a black image if it's 
enabled.

Can you try and add this functionality as packaging 
OpenImageDenoise has turned out to be a massive pain.