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As before, this is against a patch which isn't in the HEAD yet.

The tests expose bugs in an implementation of indexed type families which
hasn't been pushed to the HEAD yet. They are all marked as expect_fail.

Wrong line numbers in expected output

spawnlp doesn't exist in Windows, so this avoids using it.

We need to have a header which claims the foreign imports we do are
for entities that actually exist. Otherwise the C compiler complains.

It wasn't long enough on thorkil's Mac. Should really do something based
on the calibration value or something, I guess.