[issue10433] Document unique behavior of 'getgroups' on OSX

[Hynek Schlawack]

Hynek Schlawack <hs at ox.cx> added the comment:

This one LGTM, still applies cleanly against current tip and is languishing for a way to long time.

Commit & close?

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nosy: +hynek
versions: +Python 3.3

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