[issue17041] Fix tests for build --without-doc-strings

[Stefan Krah]

Stefan Krah added the comment:

Right, keeping the cases separate is indeed clearer.

Serhiy, in case you are waiting for my "stick to minimal changes" comment to be
resolved:  People apparently *do* use --without-doc-strings, so the additional
code in test_pydoc.py is really fine.

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<http://bugs.python.org/issue17041>
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