https://bugs.winehq.org/show_bug.cgi?id=46388
--- Comment #1 from Ken Thomases ken@codeweavers.com --- The Wineskin folks need to build Wine against libgnutls and to ship libgnutls, too. You should file a bug with the Wineskin project.
For that matter, Wine's packagers need to do so, as well. That's bug 45714.
Just a plug, since I work for CodeWeavers: CrossOver is built against and ships libgnutls which fixes this bug.