Windows: Add GetFileInformationByHandleEx to fs_InAFS

Windows: Add GetFileInformationByHandleEx to fs_InAFS

If available on the operating system, use
GetFileInformationByHandleEx to translate the path into
the file system normalized form.  This permits paths that
cross NTFS reparse points to be successfully evaluated as
being in afs.   For example:

  c:\afs -> \\afs\all

GetFileInformationByHandleEx is integrated into Vista and
Server 2008 and above.

Change-Id: I57443b01c753f12665aaac5718f639e389e2e822
Reviewed-on: http://gerrit.openafs.org/4778
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>