Remove uses of BOOST_SYSTEM_HAS_SYSTEM_ERROR

include/boost/system/detail/error_condition.hpp

@@ -199,8 +199,6 @@ public:
         return !( lhs == rhs );
     }
 
-#if defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR)
-
     operator std::error_condition () const
     {
 // This condition must be the same as the one in error_category_impl.hpp
@@ -294,8 +292,6 @@ public:
         return !( lhs == rhs );
     }
 
-#endif
-
     std::string to_string() const
     {
         std::string r( "cond:" );