misc/dist: label 386 and amd64 as "32-bit x86" and "64-bit x86"
misc/dist: label 386 and amd64 as "32-bit x86" and "64-bit x86"

R=golang-dev, bradfitz
CC=golang-dev
http://codereview.appspot.com/5986043

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