bpo-33898: Fix pathlib issues with Windows device paths

[AlbinaGiliazova]

https://bugs.python.org/issue33898
Now it should work correctly for all mentioned test examples but no changes made for GlobalRoot case as no examples were provided.

https://bugs.python.org/issue33898

[the-knights-who-say-ni]

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[AlbinaGiliazova]

Wow! It passed whitespace checks finally. I thought it's impossible. Btw CLA is signed but waiting for approvement.

[zooba]

Thanks for doing this patch! A couple of minor suggestions, and a question or two.

[AlbinaGiliazova]

I've made the improvements requested. Should I do something else or just wait for another review?

[csabella]

@zooba It appears that @AlbinaGiliazova addressed all your review concerns. Would you have an opportunity to review the changes? Thanks!

[zooba]

Thanks for the ping! We're nearly there, just little nits that we don't want making it into the codebase.

[csabella]

@eryksun, would you be able to review this per @zooba's request on the bug tracker. Thanks!

[eryksun]

@csabella, thanks for the reminder. I missed the tracker notification.

[csabella]

@eryksun, ping

[AlbinaGiliazova]

Hello. How do I make backports. Is there an instruction?

[csabella]

@AlbinaGiliazova, you wouldn't need to do anything for the backports unless the bot is unable to create them.

[barneygale]

Code looks good to me, but this needs tests!

[ambv]

This missed the boat for inclusion in Python 3.9 which accepts security fixes only as of today.

[barneygale]

Thanks for this PR, @AlbinaGiliazova! The issue has now been resolved by another PR, so I'll close this PR. Hope that's alright, thanks again.