add freebsd to the list of os'es. make the GOOS/GOARCH pair a table to avoid the confusion caused when it was of the form linux/386.
add freebsd to the list of os'es.
make the GOOS/GOARCH pair a table to avoid the confusion caused when it was of the form linux/386.

R=rsc
CC=golang-dev
http://codereview.appspot.com/160061

h8liu/golang,apparentlymart/golang,gnanderson/go,bdwalton/debian-golang,gnanderson/go,ssrl/go,gnanderson/go,h8liu/golang,apparentlymart/golang,ssrl/go,nightlyone/golang,h8liu/golang,gnanderson/go,tv42/old-go,tv42/old-go,ssrl/go,bdwalton/debian-golang,bdwalton/debian-golang,apparentlymart/golang,dsriram/golang,h8liu/golang,nightlyone/golang,dsriram/golang,ssrl/go,apparentlymart/golang,nightlyone/golang,apparentlymart/golang,pombredanne/go-deleteme,tianon/debian-golang,tianon/debian-golang,dsriram/golang,tv42/old-go,tianon/debian-golang,nightlyone/golang,bdwalton/debian-golang,pombredanne/go-deleteme,gnanderson/go,dsriram/golang,bdwalton/debian-golang,tv42/old-go,tianon/debian-golang,ssrl/go,pombredanne/go-deleteme,tv42/old-go,nightlyone/golang,gnanderson/go,pombredanne/go-deleteme,bdwalton/debian-golang,tv42/old-go,h8liu/golang,dsriram/golang,nightlyone/golang,ssrl/go,pombredanne/go-deleteme,bdwalton/debian-golang,pombredanne/go-deleteme,pombredanne/go-deleteme,apparentlymart/golang,tianon/debian-golang,gnanderson/go,nightlyone/golang,bdwalton/debian-golang,h8liu/golang,dsriram/golang,ssrl/go,tv42/old-go,h8liu/golang,tianon/debian-golang,dsriram/golang,apparentlymart/golang,tianon/debian-golang,tianon/debian-golang