FIX byte-order bug
FIX byte-order bug

see previous commit, native ++hmac byte order was correct for short keys already

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