lib/raid6: update test program for recovery functions

Test each combination of recovery and syndrome generation
functions.

Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>

diff --cc lib/raid6/test/Makefile
Simple merge

diff --cc lib/raid6/test/test.c
Simple merge

diff --cc lib/raid6/x86.h
Simple merge