message: Remove unneeded XInclude from MaterialBasic.mtlx
diff: <?xml version="1.0" encoding="UTF-8"?>
  <materialx version="1.36">
  - <xi:include href="GeomInfos.mtlx"/>
  -
  <nodedef name="ND_simplesrf_surface" type="surfaceshader" node="simplesrf">
  <input name="diff_albedo" type="color3" value="0.18,0.18,0.18"/>
  <input name="spec_color" type="color3" value="1,1,1"/>
  