Support %pc for SSO.
Support %pc for SSO.

ngzax/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,Fang-/arvo,urbit/urbit,jfranklin9000/urbit,ngzax/urbit,cgyarvin/arvo,urbit/urbit,joemfb/arvo,urbit/urbit,ohAitch/arvo,solri/arvo,ngzax/urbit,ngzax/urbit,jfranklin9000/urbit,urbit/urbit,eglaysher/arvo,jfranklin9000/urbit,joemfb/arvo,jfranklin9000/urbit,belisarius222/arvo,jfranklin9000/urbit,jfranklin9000/urbit,belisarius222/arvo,ngzax/urbit,jfranklin9000/urbit,ohAitch/arvo,urbit/urbit,cgyarvin/arvo