param.h : enable defines for PPC970 on DarwinOS
fixes:
gemm.c: In function 'sgemm_':
../common_param.h:981:18: error: 'SGEMM_DEFAULT_P' undeclared (first use in this function)
#define SGEMM_P  SGEMM_DEFAULT_P
^
@@ -1999,7 +1999,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#define ZGEMM_DEFAULT_UNROLL_M 2
#define ZGEMM_DEFAULT_UNROLL_N 2
-#ifdef OS_LINUX
+#if defined(OS_LINUX) || defined(OS_DARWIN)
#if L2_SIZE == 1024976
#define SGEMM_DEFAULT_P 320
#define DGEMM_DEFAULT_P 256
