[Merge] ~xypron/livecd-rootfs:sunset_allwinner_flavour into livecd-rootfs:ubuntu/master

[Łukasz Zemczak]

Review: Needs Fixing

Yes, I agree with Dimitri here. We should be mindful that the riscv64 case is not the only valid case for builds, and that for other flavors/platforms we might not want to fallback to generic in such case.

Just adding allwinner to the generic case would be my way to go as well.
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https://code.launchpad.net/~xypron/livecd-rootfs/+git/livecd-rootfs/+merge/445903
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