[PATCH] d3dx9_36: implement (?) loading user data in D3DXLoadMeshHierarchyFromXInMemory

[Rafał Mużyło]

Question mark, cause it's likely broken is some way.
Yet, things still work at least as good as before and going by the
description of how things are supposed to work, this should be close to
that.

Signed-off-by: Rafał Mużyło