Allow bdist_wheel working without ctypes

[youknowone]

Hi, I am a developer of RustPython project.

Currently RustPython barely can run pip, but installing projects usually fails due to lack of ctypes - which is mostly not mandatory.

This patch makes ctypes optional in most of platforms and situations.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.09%. Comparing base (4ec2ae3) to head (9de24bd).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #613   +/-   ##
=======================================
  Coverage   71.09%   71.09%           
=======================================
  Files          13       13           
  Lines        1083     1083           
=======================================
  Hits          770      770           
  Misses        313      313           

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[youknowone]

@henryiii Could you review it again?

[carrt123]

Can rustpython use pip to download libraries that rely on C extensions?
I encountered the error"ModuleNotFoundError: No module named '_ctypes'when downloading some libraries that rely on C extensions. For example, download: ujson, markupsafe.
but, those libraries written by pure cpython I can download normally.