Linux: Don't preprocess osi_vfs.h

Linux: Don't preprocess osi_vfs.h

Before we did inodes properly, we needed to pre-process osi_vfs.h,
in order to merge our inode structure with the Linux one. Ever since
we moved to native inodes, that preprocessing has been disabled, and
we've just copied osi_vfs.hin to osf_vfs.h Skip this pointless step,
permanently rename osi_vfs.hin to osi_vfs.h, and remove the unused
support scripts.

Change-Id: I5e21eccf2242080cd8b994bd1654260bfb531420
Reviewed-on: http://gerrit.openafs.org/1856
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>