mail/mu should require mail/gmime26

[_1126 (Christian Lask)]

Hey (again)!

mail/mu is able to decrypt pgp/mime encrypted messages. "mu view
--decrypt" then uses the gpg-daemon to ask for gpg-passphrase.

However, to enable this feature, mail/gmime26 has to be installed. It
might be useful to include this as a dependency to mail/mu - or to
enable an option, say, "enable pgp support" which then pulls in
mail/gmime26.

Best regards!

_1126