undo CL 5530063 / 1d7295fdf62e
undo CL 5530063 / 1d7295fdf62e

runtime: enable runtime.ncpu on FreeBSD

««« original CL description
cmd/go: fix freebsd build

R=golang-dev, adg
CC=golang-dev
http://codereview.appspot.com/5530063
»»»

R=golang-dev, rsc
CC=golang-dev
http://codereview.appspot.com/5531059

apparentlymart/golang,tv42/old-go,gnanderson/go,apparentlymart/golang,tv42/old-go,dsriram/golang,pombredanne/go-deleteme,gnanderson/go,gnanderson/go,pombredanne/go-deleteme,dsriram/golang,apparentlymart/golang,tv42/old-go,pombredanne/go-deleteme,tv42/old-go,gnanderson/go,pombredanne/go-deleteme,pombredanne/go-deleteme,gnanderson/go,dsriram/golang,gnanderson/go,gnanderson/go,tv42/old-go,apparentlymart/golang,tv42/old-go,apparentlymart/golang,dsriram/golang,apparentlymart/golang,dsriram/golang,dsriram/golang,pombredanne/go-deleteme,dsriram/golang,apparentlymart/golang,tv42/old-go,pombredanne/go-deleteme