LU-2800 autoconf: remove LC_PAGE_CONSTANT

LU-2800 autoconf: remove LC_PAGE_CONSTANT

The purpose of this patch was to see if the kernel
was patched to support raid5 zerocopy. This only was
supported on RHLE5 servers which means this test can
be removed now.

Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: I36276dfee7a6247719e716a9a304453dd519acdb
Reviewed-on: http://review.whamcloud.com/5339
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Minh Diep <minh.diep@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>