Two and a half decades ago, there were plans to support HP-UX syscalls
in Linux. This was never fully implemented, never worked and was never
actually used by anybody.
Let's simply drop this define now and free it up for other usages.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Helge Deller <deller@gmx.de>