[Merge] ~adam-retter/uvtool:emu-riscv64 into uvtool:main

[Christian Ehrhardt ]

Hi, thank you so much - I didn't find the time yet for this...

You are extending the approach I had added for armhf +1 to that from that POV

Some review thoughts split into individual comments for context ...
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https://code.launchpad.net/~adam-retter/uvtool/+git/uvtool/+merge/457345
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