Linux: 2.6.35 - fsync no longer takes a dentry

Linux: 2.6.35 - fsync no longer takes a dentry

In 2.6.35, the fsync file operations drops the dentry argument.
Add a configure test and cope.

Reviewed-on: http://gerrit.openafs.org/2064
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry-picked from commit 4d89ce0a89e9b9e2709e6f6d730f245b5bce744b)

Reviewed-on: http://gerrit.openafs.org/2549
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 58bffd741cdc917f164f19b4621aa2567e6a5b3e)
Change-Id: Ibeb609a57003fc863568e4fc619db9746aa9462f
Reviewed-on: http://gerrit.openafs.org/3520
Reviewed-by: Simon Wilkinson <sxw@inf.ed.ac.uk>