See also https://mail.kde.org/pipermail/kde-windows/2017-May/010133.html .
This attempt did not work, because libs/runtime does not become a _runtime_
dependency.
Note that MSVC-runtime is still handled separately (as before). Due to
8e1cfcf995b325e119904990e5dd13c78b93e605 we don't need any additional check on
the compiler in use.