Add BOOST_NO_CXX17_STRUCTURED_BINDINGS detection

include/boost/config/compiler/codegear.hpp

@@ -154,6 +154,15 @@
 #  define BOOST_NO_CXX14_VARIABLE_TEMPLATES
 #endif
 
+// C++17
+#if !defined(__cpp_structured_bindings) || (__cpp_structured_bindings < 201606)
+#  define BOOST_NO_CXX17_STRUCTURED_BINDINGS
+#endif
+
+#if !defined(__cpp_inline_variables) || (__cpp_inline_variables < 201606)
+#  define BOOST_NO_CXX17_INLINE_VARIABLES
+#endif
+
 //
 // TR1 macros:
 //