Limit MAX_CPU to 1024 for now

Some Linux distributions (notably SuSE) have raised CPU_SETSIZE to 4096, apparently disregarding API limitations.
From #1348, the highest value to survive array initialization (on a desktop system) is 3232, and 1024 - which is the 
more usual CPU_SETSIZE limit, was demonstrated to work fine on an actual bignuma system.

driver/others/init.c

@@ -90,9 +90,11 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #if defined(BIGNUMA)
 // max number of nodes as defined in numa.h
-// max cpus as defined in sched.h
+// max cpus as defined in most sched.h
+// cannot use CPU_SETSIZE directly as some
+// Linux distributors set it to 4096 
 #define MAX_NODES	128
-#define MAX_CPUS	CPU_SETSIZE
+#define MAX_CPUS	1024
 #else
 #define MAX_NODES	16
 #define MAX_CPUS	256