[issue20128] Re-enable test_modules_search_builtin() in test_pydoc

[koobs]

koobs added the comment:

test_synopsis_sourceless is also failing on koobs-freebsd9 (3.4) and has been for a while. Failing test inlined here, for full buildlog, see msg215997 in #20123

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ERROR: test_synopsis_sourceless (test.test_pydoc.PydocDocTest)
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Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.4.koobs-freebsd9/build/Lib/test/test_pydoc.py", line 504, in test_synopsis_sourceless
    synopsis = pydoc.synopsis(filename)
  File "/usr/home/buildbot/python/3.4.koobs-freebsd9/build/Lib/pydoc.py", line 238, in synopsis
    mtime = os.stat(filename).st_mtime
FileNotFoundError: [Errno 2] No such file or directory: '/usr/home/buildbot/python/3.4.koobs-freebsd9/build/Lib/__pycache__/os.cpython-34.pyc'

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<http://bugs.python.org/issue20128>
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