bug#36977: Add OpenSubdiv library, and add as Blender dependency

[Carlo Zancanaro]

On Fri, Aug 09 2019, Christopher Lemmer Webber wrote:
> I was surprised to open Blender 2.80 and find that subdivision 
> surfaces (necessary for organic modeling) were doing nothing.  I 
> couldn't figure out why this was, until I found out that Blender 
> now uses OpenSubdiv for subdivision surfaces.

I gave this a go, but it didn't go as smoothly as I had hoped. I 
packaged opensubdiv, which I have attached, but adding it to the 
Blender inputs didn't cause the subdivision modifier to work. I'm 
not really able to take this any further, but this is at least 
something to start with!

0001-gnu-Add-opensubdiv.patch
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