Test failing on some architectures

[juliangilbey]

mystic/tests/test_collapse.py fails at line 177 on several architectures on Debian (see https://tracker.debian.org/pkg/mystic): these include armel, armhf, i386 and ppc64el. Running the test manually, as the error message is quite uninformative, we find that on i386:

>>> ct.collapse_position(m, mask=((0,1,2),((0,1),(1,2),(0,2))))
((1, 1, 2), ((0, 2), (0, 1), (1, 2)))
>>> x = ct.collapse_position(m, mask=((0,1,2),((0,1),(1,2),(0,2))))
>>> x == ((1,1,2), ((0,1),(0,2),(1,2)))
False

The order of the elements in the second tuple has changed.

The test succeeds on other architectures (amd64, arm64, s390x), so it seems that there is something flaky about the order of the result here.