David Edmundson authored Jan 25, 2021 and Vlad Zahorodnii committed Jan 26, 2021

This is a copy of the code from Qt5.15 with some backported patches from
development branch of Qt.

One of the upcoming fixes introduces new API, which is why we can't rely
on distro packaging.

The cmake macro is mostly copied from ECM, but set to rebuild generated
code when the scanner changes.