misc/dist: add 'label' part of distro name, include blog content
misc/dist: add 'label' part of distro name, include blog content

This will allow us to cut binaries with names like:
        go1.2rc1.darwin-amd64-osx10.6.pkg
        go1.2rc1.darwin-amd64-osx10.8.pkg

R=golang-dev, r
CC=golang-dev
https://codereview.appspot.com/13629045

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