fixing mantis #3362


git-svn-id: https://gnunet.org/svn/gnunet@32906 140774ce-b5e7-0310-ab8b-a85725594a96
missing ifndefs in headers


git-svn-id: https://gnunet.org/svn/gnunet@32907 140774ce-b5e7-0310-ab8b-a85725594a96
missing struct definition in header


git-svn-id: https://gnunet.org/svn/gnunet@32908 140774ce-b5e7-0310-ab8b-a85725594a96