Revert "arvo: temporary, build +brass out of /not-sys"
Revert "arvo: temporary, build +brass out of /not-sys"

This reverts commit 44b4dc0e33e92b624466141216a3885b691a1859.

ngzax/urbit,ngzax/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,urbit/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit