Add macro BOOST_MSSTL_VERSION

test/config_info.cpp

@@ -1277,6 +1277,7 @@ void print_boost_macros()
    PRINT_MACRO(BOOST_CLANG);
    PRINT_MACRO(BOOST_CLANG_VERSION);
    PRINT_MACRO(BOOST_LIBSTDCXX_VERSION);
+   PRINT_MACRO(BOOST_MSSTL_VERSION);
    PRINT_MACRO(BOOST_STD_EXTENSION_NAMESPACE);
    PRINT_MACRO(BOOST_UNREACHABLE_RETURN(0));
    PRINT_MACRO(BOOST_CONSTEXPR);