AmigaOS support

[polluks]

Many Amiga Luas do not implement io.popen,
would you like to add a fallback?

[rice7th]

I do not have an amiga machine with me at the moment, but i would like to add support for that too. So i will research a bit and i will try to implement it. Thanks for the tip.

[polluks]

ready :-)

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