TST: relax test precision a little for 32-bit 32-bit giving test precision error::

    line 154, in test_mu2tet
   assert_equal(intvol.mu2_tet(0,0,0,0,1,0,0,1,0,1), (3./2 +
               np.sqrt(3./4))/2)
   AssertionError: 1.1830127018922194 != 1.1830127018922192

See: https://travis-ci.org/MacPython/nipy-wheels/jobs/140268243#L451

Gbp-Pq: Name changeset_78ced182c4b4583c9a2ed3c1fc01764941560c72.diff

nipy (0.4.0+git26-gf8d3149-2+rpi1) buster-staging; urgency=medium

  * Disable testsuite.

[dgit import unpatched nipy 0.4.0+git26-gf8d3149-2+rpi1]

Import nipy_0.4.0+git26-gf8d3149-2+rpi1.debian.tar.xz

[dgit import tarball nipy 0.4.0+git26-gf8d3149-2+rpi1 nipy_0.4.0+git26-gf8d3149-2+rpi1.debian.tar.xz]

Import nipy_0.4.0+git26-gf8d3149.orig.tar.gz

[dgit import orig nipy_0.4.0+git26-gf8d3149.orig.tar.gz]