[issue10030] Patch for zip decryption speedup

[Shashank]

Shashank <shashank.sunny.singh at gmail.com> added the comment:

Attached is a patch with changes in Lib/test/test_zipfile.py to test both C and pure-py impls (on systems where the C impl is present).

Admittedly, this approach to emulating the absence of C impl is a bit hacky. This is primarily because the changed class is not a part of the public API and hence not being tested directly.

David, could you verify that the approach is ok?

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Added file: http://bugs.python.org/file19196/zipdecrypt.patch

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