I just removed ~ xorg-server as part of the cleanup (just ftr 1.7.6 is stable candidate so it will stay) and it broke deps for that version of tigervnc. I masked it for now so you can make it depend on 1.7.6 if it is possible or add new snapshot that could do it (i dont wan't to break it more). Sorry for the inconvience i didn't simply know that some package unpacks and bundle xorg-server.
Fixed, thanks.