[issue19412] Add a test.support decorator for tests that require C level docstrings

[Roundup Robot]

Roundup Robot added the comment:

New changeset 1927b7c01c78 by Nick Coghlan in branch 'default':
Mitigate #19412: restore test skips for --without-doc-strings
http://hg.python.org/cpython/rev/1927b7c01c78

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nosy: +python-dev

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