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

[R. David Murray]

R. David Murray added the comment:

Once upon a time (two years ago?) we fixed the tests so that they ran successfully (skipped when appropriate) with -OO set, which omits docstrings.  We were checking for the optimization level (sys.flags.optimize) then.  It seems like it would make more sense to combine both checks into one decorator.

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nosy: +r.david.murray

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