[docs] [issue23746] sysconfg.is_python_build() is buggy

[Vinay Sajip]

Vinay Sajip added the comment:

It's not *only* used in test - it's also used in third party libraries. For example, it's used in distlib (which is vendored by pip) to determine whether it's being run from a source build.

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nosy: +vinay.sajip

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<https://bugs.python.org/issue23746>
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