Some tests failed when Python built without docstrings (--without-doc-strings options). Proposed patch fixes most of tests.

Only doctests in test_generators and test_genexps don't fixed. I don't know how to make doctests conditional.

[135/372] test_generators
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File "/home/serhiy/py/cpython-without-doc-strings/Lib/test/test_generators.py", line ?, in test.test_generators.__test__.email
Failed example:
    print(i.__next__.__doc__)
Expected:
    x.__next__() <==> next(x)
Got:
    <BLANKLINE>
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1 items had failures:
   1 of  31 in test.test_generators.__test__.email
***Test Failed*** 1 failures.
test test_generators failed -- 1 of 287 doctests failed

[137/372/1] test_genexps
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File "/home/serhiy/py/cpython-without-doc-strings/Lib/test/test_genexps.py", line ?, in test.test_genexps.__test__.doctests
Failed example:
    print(g.__next__.__doc__)
Expected:
    x.__next__() <==> next(x)
Got:
    <BLANKLINE>
**********************************************************************
1 items had failures:
   1 of  75 in test.test_genexps.__test__.doctests
***Test Failed*** 1 failures.
test test_genexps failed -- 1 of 75 doctests failed