qt_generate_deploy_qml_app_script generates an unusable deploy script

I get an unusable deploy script when using `qt_generate_deploy_qml_app_script` in my Qt 6.4.2 project. It looks like this:

include()
_qt_internal_show_skip_runtime_deploy_message("static Qt libs")
_qt_internal_show_skip_qml_runtime_deploy_message()

which of course produces errors when invoked in the `cmake install` step. More details are captured in this forum link that I created:

https://forum.qt.io/topic/144883/qt_generate_deploy_qml_app_script-generates-script-with-empty-include