If the power were to fail, it doesn't matter to us much if the data
makes it to disk or not, we'd have other problems. However an fsync()
call on a multi build autobuilder is painful so lets avoid them.
This is particularly true in this case if a timeout causes a reconnect
during a build.
(Bitbake rev: ec28256ac2a30f047585e8f61200d764bc295ded)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>