minor fix to build script

build.sh

 #!/bin/bash
 
+ncore=64
+PWD=`pwd`
+bnx_dir="$PWD/drivers/net/ethernet/broadcom/bnx2x"
+
 date
-make -j 32 > make.out 2>&1
+make modules M=$bnx_dir -j $ncore > make.out 2>&1
+make -j $ncore >> make.out 2>&1
 date