gh-145410: Use _sysconfig.get_platform() in the platform module

[vstinner]

• Issue: sysconfig.get_platform() could return wrong value because sys.version is truncated #145410

[vstinner]

The change avoids the WMI query (SELECT Architecture FROM Win32_Processor) in platform.machine() for these 4 sysconfig platforms: win32, win-amd64, win-arm32 and win-arm64.

cc @zooba

[vstinner]

See also issues gh-102536 and gh-98962.

[malemburg]

This looks fine, but can we be sure that the output does not change across supported Windows platforms ?

[vstinner]

According to #98962 (comment) comment, platform.architecture() is always ARM64, whereas sysconfig.get_platform() can be win-arm64, win-amd64 or win32 when Python is built for different architectures and run on ARM64 Windows. So it seems like platform.architecture() is not directly related to sysconfig.get_platform(), they can be different and my change is wrong.

[vstinner]

cc @diegorusso