HELP! Passwords stuck in passwd file!

I am migrating from 7.2 -> 7.4.  I can't figure out how to move the
crypt()'ed passwords I made with pg_password utility into the pg_shadow
table.  All I can find in the documentation is (in 7.3 release notes)

 Remove secondary password file capability and pg_password utility
  (Bruce)


Any ideas besides "re-enroll your users"?

Thanks,

Michael