[issue43106] Some macOS open flags are missing from posixmodule.c

[Dong-hee Na]

Dong-hee Na <donghee.na at python.org> added the comment:

O_FSYNC could be used as an alias of O_SYNC.
O_EVTONLY is used for kqueue API.

but other flags I don't know where to use it.
So I submit the patch to add O_FSYNC and O_EVTONLY only.

If other flags should be added, please let me know

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<https://bugs.python.org/issue43106>
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