Bug#1020060: statsmodels: FTBFS: make[1]: *** [debian/rules:105: override_dh_auto_test] Error 1

[Rebecca N. Palmer]

This is the same test as #1014278 / upstream 8341, but now on amd64. 
 From the upstream discussion, it may be a numerically unstable test.

It doesn't fail everywhere: a test build on Salsa CI passed, as did the 
last debci runs.  (reproducible-builds FTBFS on the second build, on 
amd64/sid only, but on a _different_ test.)