Remove ports/japanese/pine.
Even though this port has some useful features, like Japanese help files
and direct support for Japanese input using Canna on the Pico editor,
I decided to remove this port as:

1. It seems to continue to have security problems, which no one seems to be working on.
2. mail/pine4 seems to support Japanese.
3. It doesn't seem like there will be an upgrade to this Japanize patch.