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Currently `setuptools` assumes that torhcaudio is zip safe and performs
egg (zip) installation when `python setup.py install` (or `pip install .`).

When `torchaudio` loads extension module written with Torchscript, 
the corresponding loading function requires the `so` file to be present as 
an actual file, and this does not work well with egg installation.

This CC fixes this by setting `zip_safe=False` in setup.py and disable egg
installation, so that `python setup.py install` installs uncompressed files
with regular directory structure.