[issue8710] test_xpickle: compat tests: workaround for missing test_support

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

I think this is a distro bug.  Debian for example does not ship tests but has test.__init__, regrtest and test_support.

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<http://bugs.python.org/issue8710>
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