Possible issues with arpack-3.9.0

Possible issues with arpack-3.9.0

[Sam James]

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Hi folks,

I came across this a week or so ago and it came back to mind because of
the openblas kerfuffle [0].

arpack-3.9.0 will in some cases give deterministic failure as the
randomness in the retry mechanism seems busted.

This can cause e.g. igraph's test suite to fail.

References:
- https://github.com/opencollab/arpack-ng/issues/401
- https://github.com/opencollab/arpack-ng/issues/410

Ths discussion is quite long and the second bug linked tries
to summarise it. It's complicated and for now I've just yanked
arpack-3.9.0 in Gentoo (masked it).

[0] https://lore.kernel.org/distributions/CAE6_+UeiCzpyA9-XVgX1x5Ucjccng0rdw-+WCZbtMnLX8VOKgQ@mail.gmail.com/T/#m6ed52b95d975ae3b047f5704e6f2cc9914e112fe

best,
sam

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