When configuring an example like
widgets/tools/plugandpaint/plugins/basictools outside of a Qt build,
the configuration fails because it tries to call the internal function
instead of the public one.
This was needed some time ago to facilitate moving from qt_add_plugin
to qt_internal_add_plugin, so some compatibility code was added.
But we've now migrated to qt_internal_add_plugin across most repos,
so we should remove the compatibility code to allow examples to
configure successfully.
Amends 6fbeef4c6b
Fixes: QTBUG-86858
Change-Id: Ib15f50351a8742c44d7a8be84be4e576cb48bddb
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
c6b3680bcf