Rename walmethod fsync method to sync

Magnus Hagander <magnus@hagander.net>

Commit: eade082b122889eaf92eb806b8b6799160a25256
Author: Magnus Hagander <magnus@hagander.net>
Date: 2016-10-23T16:04:34Z
Releases: 10.0
Rename walmethod fsync method to sync

Using the name fsync clashed with the #define we have on Windows that
redefines it to _commit. Naming it sync should remove that conflict.

Per all the Windows buildfarm members

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