cmake fix for embree

Former-commit-id: 55e97852190d6e8dacbd12076adebfeb8ecb2cb2

tutorial/cmake/FindEMBREE.cmake

@@ -44,5 +44,5 @@ IF (EMBREE_FOUND)
    )
    SET(EMBREE_INCLUDE_DIRS ${EMBREE_INCLUDE_DIR} ${EMBREE_INCLUDE_DIR}/embree)
 ELSE (EMBREE_FOUND)
-    message(FATAL_ERROR "could NOT find EMBREE")
+    message(STATUS "could NOT find EMBREE")
 ENDIF (EMBREE_FOUND)