fix flattening

Author: jll63

dev/local-flat.sh

@@ -6,5 +6,7 @@ python3 dev/flatten.py \
   include/boost/openmethod/shared_ptr.hpp \
   include/boost/openmethod/compiler.hpp
 python3 dev/flatten.py \
-  flat/boost/openmethod/policies.hpp \
-  include/boost/openmethod/policies.hpp
+  flat/boost/openmethod/registry.hpp \
+  include/boost/openmethod/registry.hpp \
+  include/boost/openmethod/policies/*.hpp \
+  include/boost/openmethod/default_registry.hpp