AVX2 code fails in gcc 8/9 on several platforms about dilithium HOT 4 CLOSED

If you do not trust the OQS container, here's a way to create a pristine docker environment to reproduce completely without OQS dependencies:

docker run -v `pwd`:/root/dilithium -it centos:8 bash

In that container, first deploy tooling to build code by running yum install -y gcc make openssl-devel. Then proceed with build-and-test.

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Should you further have no trust in the Centos or docker environment, the bug is also reproducible (as initially reported by Douglas) on OSX: Just set CC=gcc-8 and you find the same (signature) verification errors.

Actually, after having installed gcc-8 also in a standard Ubuntu environment, you get the same bug (setting CC=gcc-8): See this branch for most simple reproducibility: https://github.com/baentsch/dilithium/tree/gcc8-bug -- completely without any OQS component/dependency.

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Hopefully last update for today: Problem also persists when using gcc-9.

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Should work now (see PR #35).

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