message: add fatal error if using Embree v3.6.0
diff: @@ -329,6 +329,10 @@ macro(ospray_find_embree EMBREE_VERSION_REQUIRED)
  endif()
  set(EMBREE_LIBRARIES ${EMBREE_LIBRARY})
  +
  + if ("${EMBREE_VERSION}" STREQUAL "3.6.0")
  + message(FATAL_ERROR "Embree v3.6.0 is incompatible with OSPRay.")
  + endif()
  endmacro()
  macro(ospray_determine_embree_isa_support)
  