The build is still failing, probably because ecm_find_qmlmodule is not
only present in the main CMakeLists.txt, but also in others.
$ git grep ecm_find_qmlmodule
CMakeLists.txt:ecm_find_qmlmodule(QtQuick 2.3)
CMakeLists.txt:ecm_find_qmlmodule(QtQuick.Controls 1.2)
CMakeLists.txt:ecm_find_qmlmodule(QtQuick.Layouts 1.3)
CMakeLists.txt:ecm_find_qmlmodule(QtQuick.Window 2.1)
CMakeLists.txt:ecm_find_qmlmodule(QtMultimedia 5.0)
CMakeLists.txt:ecm_find_qmlmodule(org.kde.kquickcontrolsaddons 2.0)
CMakeLists.txt:ecm_find_qmlmodule(org.kde.plasma.core 2.0)
CMakeLists.txt:ecm_find_qmlmodule(org.kde.plasma.components 2.0)
kcmkwin/kwindesktop/CMakeLists.txt:ecm_find_qmlmodule(org.kde.plasma.core 2.0)
kcmkwin/kwineffects/CMakeLists.txt:ecm_find_qmlmodule(org.kde.plasma.core 2.0)
[ci:skip-build]: don't try to build all depends, takes too long
[ci:skip-vercheck]: unblocking arm build, no need to bump pkgrel
bb5731fc5a