Try and fix gcc-4.4 -fno-rtti failure.

test/check_memory.cpp

@@ -0,0 +1,11 @@
+//  (C) Copyright John Maddock 2021. 
+//  Use, modification and distribution are subject to the 
+//  Boost Software License, Version 1.0. (See accompanying file 
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+//
+// Quick santity check that <memory> is OK.  It was broken for some old gcc versions and -fno-rtti
+//
+
+#include <memory>
+