cmake XRINTERFACE_HAS_COLLABORATION examples

Kitware/ParaView Plugins/XRInterface/Plugin/CMakeLists.txt :152 

set_property(
  SOURCE
  vtkPVXRInterfaceCollaborationClient.cxx
  pqXRInterfaceControls.cxx
  APPEND PROPERTY
    COMPILE_DEFINITIONS "XRINTERFACE_HAS_COLLABORATION=$<BOOL:${VTK_ENABLE_VR_COLLABORATION}>")