We are not using any language bindings of OSTree.
We use the C API, so no need for introspection.

And re-enable ostree/qtotaupdate now when the build
issue is fixed.

Task-number: QTBUG-55559
Change-Id: I1a7407d4e6ac3eca1083b9c28ed7aa206e0ed484
Reviewed-by: Samuli Piippo <samuli.piippo@qt.io>