Remove expired ports:
2017-05-31 mail/linux-thunderbird: Use the native thunderbird mail/thunderbird instead
2017-06-01 devel/p5-Penguin: Depends on expired security/pgp
2017-06-01 security/p5-Crypt-PGPSimple: Depends on expired security/pgp
2017-06-01 mail/pgpsendmail: Depends on expired security/pgp
2017-04-01 security/pgp: This software was last updated in 1996, use security/gnupg1 as a drop-in replacement with legacy PGP support.