[issue35346] Modernize Lib/platform.py code

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

While we are here, look at other outdated code:

* Top-imported warnings is not used.
* struct.calcsize('P') is always success.
* plistlib is always available.

Should we keep compatibility with 2.7?

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue35346>
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