use python3 to build Qt5 WebEngine module
requested to merge matthieu.gallien/craft-blueprints-kde:work/mgallien/usePython3ForQtWebEngine into dev
patch taken from Debian packaging https://salsa.debian.org/qt-kde-team/qt/qtwebengine/-/tree/082c7f7e9ee899ff5ab68a166819e2f0aaa87617/debian/patches
that would mostly port to puse python3 for webengine build except for tools from the catapult project https://chromium.googlesource.com/catapult/
the embedded copy in Qt WebEngine 5.15.15 is only compatible with python2 and requires a lot of work to move to python3
Signed-off-by: Matthieu Gallien matthieu.gallien@nextcloud.com
Edited by Matthieu Gallien