#6387: allow attributes on variants in polymorphic variant types.

git-svn-id: http://caml.inria.fr/svn/ocamldoc/trunk@14713 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Revert bad commit.

git-svn-id: http://caml.inria.fr/svn/ocamldoc/trunk@14714 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02