math/rkward: remove dependency on WebKit
- it was only a fallback for when WebEngine is not found at buildtime
Qt5Webkit will be removed at the end of the year.
See: commit e8e65e7574de0b374caaa3da0ba6a26a67103e62 www/qt5-webkit: mark for deletion Qt upstream switched to QtWebEngine quite a while ago, and the maintenance of QtWebKit was carried out by a separate person. Unfortunately, no release or updates have been pushed in the recent years. Note: there is a fork [1] of the used fork [2], that might be viable for people that really still need to rely on Qt5Webkit. [1] https://github.com/movableink/webkit/ [2] https://github.com/qtwebkit/qtwebkit