message: update to latest OSPRay 'devel'
diff: #include "OSPApp.h"
  #include "sg/geometry/TriangleMesh.h"
  #include "sg/visitor/PrintNodes.h"
  +#include "sg/visitor/VerifyNodes.h"
  #include "sg/module/Module.h"
  namespace ospray {
  @@ -117,7 +118,7 @@ namespace ospray {
  setupCamera(renderer);
  renderer["frameBuffer"]["size"] = vec2i(width, height);
  - renderer.traverse(sg::Node::VerifyNodes{});
  + renderer.traverse(sg::VerifyNodes{});
  renderer.traverse("commit");
  // last, to be able to modify all created SG nodes
  @@ -127,7 +128,7 @@ namespace ospray {
  renderer.traverse(sg::PrintNodes{});
  // recommit in case any command line options modified the scene graph
  - renderer.traverse(sg::Node::VerifyNodes{});
  + renderer.traverse(sg::VerifyNodes{});
  renderer.traverse("commit");
  render(rendererPtr);
  