To fully solve the problem, I think the patch derived from Douglas patch needs to be applied as well. It has been pushed to the gnutls 2.4.x branch upstream:
http://git.savannah.gnu.org/gitweb/?p=gnutls.git;a=commitdiff;h=49cdc97d0151a8f58a9d4e678b73656abf042051 /Simon -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org