Port to python3 and fix build with newer poppler versions Tested with poppler 0.84.0 and the versions in TW and Leap, builds fine now with python 3.8.1 too. OBS-URL: https://build.opensuse.org/request/show/765017 OBS-URL: https://build.opensuse.org/package/show/KDE:Extra/scribus?expand=0&rev=50