fix circular dependency that newer gnat complained about

git-svn-id: http://localhost:9111/private/safir_open/safir_sdk_core/trunk@1584 9dd7cf02-b8c9-4ff8-a4a5-e7fda3bdd973

Conflicts:
	src/dots/dots_ada.ss/shared/safir-dob-typesystem-object_factory.adb