Thanks for wanting to improve Python.

Your PR seems to contain quite a few changes that aren't obviously related to your topic.

As for the topic, I know there are at least some cases where we really do have to *run* the code to prove the function is supported by the platform.  That is, there are platforms that define the function but it doesn't actually work.  I don't know if that applies to the things you are changing, and it will require input from people with more knowledge of the build system than I to confirm that your changes are a good idea.