Drop `EIO_O_FSYNC` as EIO doesn't support it anymore#44

Merged

clue merged 1 commit intoreactphp:masterfrom

WyriHaximus-labs:drop-EIO_O_SYNC

Sep 16, 2018

Commits on Sep 15, 2018

Dropped `EIO_O_FSYNC` as reported at https://github.com/reactphp/filesystem/issues/34#issue-336267905
WyriHaximus
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