[python] sysconfig platform should not contain cygwin version

[lazka]

Description / Steps to reproduce the issue

$ python3 -c "import sysconfig; print(sysconfig.get_platform())"
msys-3.5.5-x86_64

This gets encoded in wheels as platform tag and newer pip has started to verify those match the installed python. So everytime we update cygwin pip will complain about all Python packages:

$ pip check
breezy 3.2.2 is not supported on this platform
Brotli 1.1.0 is not supported on this platform
Cython 3.0.11 is not supported on this platform
dulwich 0.21.7 is not supported on this platform
fastbencode 0.2 is not supported on this platform
gpg 1.24.1 is not supported on this platform
mercurial 6.9 is not supported on this platform
patiencediff 0.2.15 is not supported on this platform
pyalpm 0.10.6 is not supported on this platform
PyYAML 6.0.2 is not supported on this platform
zstandard 0.23.0 is not supported on this platform

We should look into removing the version there somehow.

Expected behavior

pip check doesn't complain

Actual behavior

it complains

Verification

• I have verified that my MSYS2 is up-to-date before submitting the report (see https://www.msys2.org/docs/updating/)

Windows Version

MSYS_NT-10.0-26100

Are you willing to submit a PR?

No response