[boost] [config] C++17 macros wanted

I have been adding C++17 features to date_time. There are two config macros, I would like to have: Test for C++17’s constexpr inline feature. Maybe call it something like: BOOST_NO_CXX17_CONSTEXPR_INLINE Test for C++17’s structured binding feature. Maybe call it something like: BOOST_NO_CXX17_STRUCT_BIND