[issue21679] Prevent extraneous fstat during open()

[Bohuslav "Slavek" Kabrda]

Bohuslav "Slavek" Kabrda added the comment:

I'm attaching fourth version of the patch. Changes:
- fileio's _blksize member is now of type T_UINT
- extended test_fileio.AutoFileTests.testAttributes to also test _blksize value

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Added file: http://bugs.python.org/file35702/python3-remove-extraneous-fstat-on-file-open-v4.patch

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