pkg/urbit/configure: cpu=$(uname -m)
pkg/urbit/configure: cpu=$(uname -m)

make pkg/urbit/configure actually able to detect CPU architecture when $HOST doesn't exist
urbit/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit