Test failure on s390x

[opoplawski]

When building the Fedora netcdf4-python package for 1.5.6 and 1.5.7 I'm getting the following test failure only on s390x:

netcdf4-python version: 1.5.7
HDF5 lib version:       1.10.7
netcdf lib version:     4.8.1
numpy version           1.21.1
cython version          0.29.24
FAIL: runTest (tst_compoundvar.VariablesTestCase)
testing compound variables
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Traceback (most recent call last):
  File "/builddir/build/BUILD/netcdf4-python-1.5.7rel/test/tst_compoundvar.py", line 72, in setUp
    assert (cmptype4 == dtype4a) # data type should be aligned
AssertionError
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[opoplawski]

FWIW - This is still present with 1.6.3 and netcdf 4.9.0.

[opoplawski]

Sill present with 1.6.5 and netcdf 4.9.2.