misc/dist: generate tarballs for Mac OS X
misc/dist: generate tarballs for Mac OS X

R=golang-dev, r
CC=golang-dev
http://codereview.appspot.com/6503118

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