Windows: More specific error values

Windows: More specific error values

When a mount point, symlink, or dfslink cannot be resolved
return STATUS_REPARSE_POINT_NOT_RESOLVED.

When an operation fails because the volume is readonly, return
STATUS_MEDIA_WRITE_PROTECTED.

Change-Id: Ib35f0d7851c087bf8aa25d4b0138ee72fb6f3c68
Reviewed-on: http://gerrit.openafs.org/6501
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Peter Scott <pscott@kerneldrivers.com>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>