[issue27186] add os.fspath()

[Jelle Zijlstra]

Jelle Zijlstra added the comment:

This patch adds support for fspath to a number of functions in the os module by augmenting the path_t argument converter.

The tests only cover a subset of the functions that use path_t, because some (e.g., unlink) have destructive side effects.

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Added file: http://bugs.python.org/file43215/issue27186-os_path_t.patch

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