[issue21384] Windows: Make handle non inheritable by default

[STINNER Victor]

STINNER Victor added the comment:

On Windows, handles are created non-inheritable by default, but I would prefer to double check.

The tool "Handle" can be used to list all open handles of a process:
http://technet.microsoft.com/en-us/sysinternals/bb896655.aspx

To test that all handles are non-inheritable: run all Python unit tests, create a subprocesss with close_fds=False, list open handles of the child process and check that the list of not longer than a fresh Python process.

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