cmake HAVE_STD_CXX17_FLAG examples

lagadic/visp cmake/VISPDetectCXXStandard.cmake :39 

mark_as_advanced(HAVE_STD_CXX17_FLAG)

lagadic/visp cmake/VISPDetectCXXStandard.cmake :122 

mark_as_advanced(HAVE_STD_CXX17_FLAG)

lagadic/visp cmake/VISPDetectCXXStandard.cmake :190 

mark_as_advanced(HAVE_STD_CXX17_FLAG)