missing relaxed constexpr macros

Hi John,
i miss these for C++17/20/23 in boost/config. Can you retrofit this?

thx
Gero



It could look like this:
see https://en.cppreference.com/w/cpp/feature_test#__cpp_constexpr

#if (__cpp_constexpr < 201703L)
	#define BOOST_NO_CXX17_CONSTEXPR
#endif

#if defined(BOOST_NO_CXX17_CONSTEXPR)
	#define BOOST_CXX17_CONSTEXPR
#else
	#define BOOST_CXX17_CONSTEXPR constexpr
#endif



#if (__cpp_constexpr < 202002L)
	#define BOOST_NO_CXX20_CONSTEXPR
#endif

#if defined(BOOST_NO_CXX20_CONSTEXPR)
	#define BOOST_CXX20_CONSTEXPR
#else
	#define BOOST_CXX20_CONSTEXPR constexpr
#endif



#if (__cpp_constexpr < 202207L)
	#define BOOST_NO_CXX23_CONSTEXPR
#endif

#if defined(BOOST_NO_CXX23_CONSTEXPR)
	#define BOOST_CXX23_CONSTEXPR
#else
	#define BOOST_CXX23_CONSTEXPR constexpr
#endif

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