Blender Git Loki

Build system: disable Draco when not installing python.

Draco py binding needs to be installed somewhere, when not installing
Python itself it's breaking the installation (since it creates a fake
empty py install, which will crash when trying to start Blender).

We could fix that in some smarter way maybe, but for now it's simpler to
just not care about Draco when we are not installing Python.