[issue26826] Expose new copy_file_range() syscall in os module.

[Marcos Dione]

Marcos Dione added the comment:

I added a couple of unit tests, which lead me to fix a couple of bugs (yay!).

I discarded the idea of removing any reference to flags.

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Added file: http://bugs.python.org/file43310/copy_file_range.diff

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