https://tracker.debian.org/pkg/dxvk says, among other things:

Issues preventing migration:
∙ Autopkgtest for dxvk/2.7.1-3: [...] loong64: Failed, ppc64el: Failed, riscv64: Failed, s390x: Failed

This appears to be because the Wine parts of dxvk are uninstallable on
these architectures, so the check-dxvk-setup test-case fails. That's to
be expected, because Wine doesn't support these architectures either.

I suggest the attached patch (untested, but I'm fairly sure it's correct).

The other half of the autopkgtest (the libdxvk-native-dev test-case)
is passing on all supported architectures, so it can stay.

Thanks,
    smcv