Bug#946422: silx: autopkgtest regression: pocl error

[Andreas Beckmann]

I've minimized it to

=====8<=====
import unittest

def suite():
    from silx.io import test as test_io
    from silx.opencl import test as test_ocl

    test_suite = unittest.TestSuite()
    test_suite.addTest(test_ocl.suite())
    return test_suite

if __name__ == '__main__':
    runner = unittest.TextTestRunner()
    if not runner.run(suite()).wasSuccessful():
        print("Test suite failed")
    else:
        print("Test suite succeeded")
=====>8=====

If I disable the useless silx.io import (or move it below silx.opencl),
the pocl lt_dlopen() error disappers and I get a test failure instead:

FAIL: test_medfilt (silx.opencl.test.test_medfilt.TestMedianFilter)
----------------------------------------------------------------------
Traceback (most recent call last):
  File
"/usr/lib/python3/dist-packages/silx/opencl/test/test_medfilt.py", line
115, in test_medfilt
    self.assertEqual(r.error, 0, 'Results are correct')
AssertionError: 3.4028235e+38 != 0 : Results are correct

So importing silx.io loads something that clashes with pocl (if loaded
afterwards)

Andreas