To increase the effective test coverage, this patch
re-enables the tst_qvariant test case as such, and
instead disables only the test functions that are currently
failing in CI.
Task-number: QTBUG-22453
Change-Id: Ibf0dc3caf50d34084fa50cf76d199e77a42f6e16
Reviewed-by: Olivier Goffart <ogoffart@kde.org>