-missing header

git-svn-id: https://gnunet.org/svn/gnunet@31341 140774ce-b5e7-0310-ab8b-a85725594a96
-fixing includex for xdht

git-svn-id: https://gnunet.org/svn/gnunet@31342 140774ce-b5e7-0310-ab8b-a85725594a96
-fixing 'make dist' issues

git-svn-id: https://gnunet.org/svn/gnunet@31343 140774ce-b5e7-0310-ab8b-a85725594a96