[issue21515] Use Linux O_TMPFILE flag in tempfile.TemporaryFile?

[STINNER Victor]

STINNER Victor added the comment:

> It would be nice if the patch added a pointer to the O_TMPFILE documentation (if that exists) and mentioned that it is Linux-specific.

I modified TemporaryFile documentation to mention that the O_TMPFILE
flag is used if available and if the flag "works".

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21515>
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