fix CPU# detection on OS X: /usr/sbin/sysctl doesn't have to be on PATH; moreover, 10.5 supports os.sysconf('SC_NPROCESSORS_ONLN'), so use that
fix CPU# detection on OS X: /usr/sbin/sysctl doesn't have to be on PATH; moreover, 10.5 supports os.sysconf('SC_NPROCESSORS_ONLN'), so use that

git-svn-id: bd2c15cabedda08daa94fbf2043b3f8588072843@1142 34294538-1d18-489e-82e9-bb8ff975a0eb

Distrotech/bakefile,Distrotech/bakefile,Distrotech/bakefile,Distrotech/bakefile