mescc-tools-extra contains two important tools:
- cp
- chmod
mes first builds itself from a mes 0.21 seed as used by guix, and then
builds a mes 0.22 and then mes 0.22 using that created mes 0.22.
It does /not/ use bootstrap.sh as we don't have a proper shell at this
point, it has been manually adapted for kaem.
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