cbc: Don't define access() on win32

access() is present in the Windows CRT:
http://msdn.microsoft.com/en-us/library/ms235395(v=vs.90).aspx

Change-Id: Ie99d1892f3ffa9d3e49e3be9c5761ebc78e596cd
Reviewed-on: http://review.couchbase.org/33324
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>