Bus error, conda recipe, macOS

In https://github.com/conda-forge/armadillo-feedstock/pull/27, when packaging for Conda, I'm adding -DBUILD_SMOKE_TEST=ON and the macOS build is failing on the cmake --build build --target test step with Bus error. See https://dev.azure.com/conda-forge/feedstock-builds/_build/results?buildId=367723&view=logs&jobId=58ac6aab-c4bc-5de2-2894-98e408cc8ec9&j=58ac6aab-c4bc-5de2-2894-98e408cc8ec9&t=933f325c-924e-533d-4d95-e93b5843ce8b

I think this is due to the better testing, rather than a change in 9.900.6, but it could be due to that change instead.

This looks related to #173 (closed)?

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