In version 5.12.6 of the 'qtdeclarative' package, the
'lib/qt5/qml/QtQuick/XmlListModel' directory is missing (qtdeclarative
5.11.3 had it).

It causes run time issues; for example the 'monero-gui'
package builds fine but it fails to run:

--8<---------------cut here---------------start------------->8---
2019-12-31 12:50:42.076	W app startd (log: /home/guillaume/.bitmonero/monero-wallet-gui.log)
2019-12-31 12:50:42.077	W Qt:5.12.6 GUI:- | screen: 1920x1080 - dpi: 96.1263 - ratio:0.997092
2019-12-31 12:50:42.179	W QQmlApplicationEngine failed to load component
2019-12-31 12:50:42.179	W qrc:/main.qml:1693 Type WizardLang unavailable
2019-12-31 12:50:42.179	W qrc:/wizard/WizardLang.qml:32 module "QtQuick.XmlListModel" is not installed
2019-12-31 12:50:42.179	E Error: no root objects
--8<---------------cut here---------------end--------------->8---