Try another g++ 4.7 workaround

test/mp_defer.cpp

@@ -10,8 +10,6 @@
 #include <boost/mp11/utility.hpp>
 #include <boost/mp11/integral.hpp>
 #include <boost/core/lightweight_test_trait.hpp>
-#include <boost/config.hpp>
-#include <boost/detail/workaround.hpp>
 #include <type_traits>
 
 using boost::mp11::mp_identity;
@@ -25,15 +23,7 @@ template<class T> struct has_type
 
     using type = decltype( f<T>(0) );
 
-#if BOOST_WORKAROUND( BOOST_GCC, < 40800 )
-
-    static constexpr auto value = type::value;
-
-#else
-
-    static const auto value = type::value;
-
-#endif
+    static const bool value = type::value;
 };
 
 using boost::mp11::mp_defer;