[issue11877] Change os.fsync() to support physical backing store syncs

[Steffen Daode Nurpmeso]

Steffen Daode Nurpmeso <sdaoden at googlemail.com> added the comment:

P.S.: dito Linux and NetBSD.  I've reused preprocessor tests
      we've discovered internally over the past years, but
      i cannot test this here.
      I could test Linux next Tuesday, though.

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