[issue43757] pathlib: move 'resolve()' logic out of path flavour

[Barney Gale]

Change by Barney Gale <barney.gale at gmail.com>:


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pull_requests: +24875
pull_request: https://github.com/python/cpython/pull/26270

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43757>
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