[issue3812] py3k build fails if configure --without-threads

[Hirokazu Yamamoto]

Hirokazu Yamamoto <ocean-city at m2.ccsnet.ne.jp> added the comment:

Simple workaround is to remove itertools from traceback module and write
equivalent code to itertools.chain.

I'm not sure it is acceptable put such limitation to standard library.
(That is, traceback is used from build process, so should not use C-module)

Added file: http://bugs.python.org/file11438/py3k_remove_itertools_from_traceback.patch

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