[issue19701] Update multiprocessing for PEP 451

[Eric Snow]

Eric Snow added the comment:

In Lib/multiprocessing/spawn.py the following need changing:

get_preparation_data()
import_main_path()

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dependencies: +refactor pythonrun.c to make use of specs (__main__.__spec__)

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<http://bugs.python.org/issue19701>
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