[issue36624] cleanup the stdlib and tests with regard to sys.platform usage

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

support.is_android has two flaws:

* it's a constant: it must be spelled as UPPER CASE
* I dislike "is_" prefix: "MS_WINDOWS" constant is commonly used, and it doesn't start with "is_".

In my PR, I used support.ANDROID.

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