[issue9332] Document requirements for os.symlink usage on Windows

[Ned Batchelder]

Ned Batchelder <nedbat at users.sourceforge.net> added the comment:

This breaks virtualenv3 on Python 3.2, which simply test for the existence of os.symlink, which then fails for lack of privileges.  Perhaps an os.can_symlink() method, returning a boolean?  It can request privileges if you like, but provides a simple test that lets scripts know whether they should attempt a symlink or not.

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nosy: +nedbat

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