bug#22123: python-statsmodels: Non-deterministic build failures on x86_64

[Mark H Weaver]

In the last month, 'python-statsmodels' has failed its test suite 5
times in the same place:

--8<---------------cut here---------------start------------->8---
statsmodels.regression.tests.test_lme.TestMixedLM.test_r(False, False, 8) ... ok
statsmodels.regression.tests.test_lme.TestMixedLM.test_r(False, True, 8) ... ok
statsmodels.regression.tests.test_lme.TestMixedLM.test_r(True, False, 8) ... ok
statsmodels.regression.tests.test_lme.TestMixedLM.test_r(True, True, 8) ... ok
statsmodels.regression.tests.test_lme.TestMixedLM.test_r(False, False, 3) ... 
phase `check' failed after 603.2 seconds
builder for 
`/gnu/store/4b6pmjpjk6qpaq925q8qwwg5s65mw9x3-python-statsmodels-0.6.1.drv' 
failed with exit code 1
--8<---------------cut here---------------end--------------->8---

The failure is always during the "TestMixedLM.test_r(False, False, 3)"
test, and the failed log is always the same, with no newline printed
after the ellipses before the "phase `check' failed" message.

After restarting, the same builds later succeed.

     Mark