Wine 2.19 was released a week ago and the staging patches are now available as well. ( https://github.com/wine-compholio/wine-staging/releases ) I was able to copy the ebuild from 2.17-r1 to 2.19. I only needed to remove the freetype-2.8.1 patches (bug 631676) and the "multislot-apploader" patch.
Thank you.