Create patched versions of python packaging tools to avoid version checks

[jonringer]

Describe the bug

Versioning within python is usually a determinate to us. Should we just modify the main packaging packages to allow for a --skip-version-check option?

cc @FRidh @mweinelt @fabaff @dotlambda

[FRidh]

I don't understand quite what you mean here. Do you want that buildPython* has an option to disable version checks altogether? Or should it be able to ignore just constraints related to a specific package? pip already supports this when building a wheel, and so does build #105714.

[jonringer]

Do you want that buildPython* has an option to disable version checks altogether?

I would like for that to be the default, as there a lot of patching done as it's not expect to explicitly disable it.

pip already supports this when building a wheel, and so does build #105714.

Sure, but setuptools and other pep517 tools also do their own version checking. I was referring to these. and making pip always disabled by default.

[jonringer]

pythonRelaxDepsHook now exists. No longer relevant