[docs] [issue5784] raw deflate format and zlib module

[Martin Panter]

Martin Panter added the comment:

> v = tuple(map(int, zlib.ZLIB_RUNTIME_VERSION.split(".")))
> supports_wbits_0 = v >= (1, 2, 3, 5)

That was basically my first thought. But I didn’t want to presume that every element of the version is an integer. For instance, the current string in the “develop” branch of zlib has "1.2.8.1-motley".

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