Replace previous code that used internal pmbootstrap code with running
pmbootstrap directly. pmbootstrap doesn't really have a stable API yet,
so calling the internal code is always a bit fragile and now that we
have reworked a lot of its code, this is all broken.
The trade-off is that it is now slower and the output isn't as pretty,
but we can finally use kconfigcheck.toml from the pmaports branch. So it
is worth it!
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