vere: alphabetize getopt short options
vere: alphabetize getopt short options

Tested by building vere and trying it with `-B`, `-p`, and `-F`.
ngzax/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,urbit/urbit