Log Message:
Update of mail/nail to 11.12.

Changes from 11.11 include:
* Blank characters between MIME encoded words in header fields are now
  discarded for display purposes as demanded by RFC 2047.
* Unless the 'fullnames' variable was set, nail did not generate 'To' header
  fields when replying to messages since version 11.5 (Bugreport by Bob
  Tennent).
* An internal problem in the token scanning for junk mail detection has been
  fixed; the end of the mail header was not always correctly determined.
* Special characters in IMAP or POP3 account strings like 'imap://user@host'
  can now be escaped using URL notation, e.g. 'foo%2Fbar' for 'foo/bar'. It
  was previously not possible to use these characters. This is a slightly
  incompatible change as the '%' character must now also be escaped, as
  '%25'. (Bugreport by Thomas Wolff.)
* The system mailbox is now locked using fcntl(2) for reading too (Problem
  reported by Thomas Wolff).
* When new mail arrives in an IMAP mailbox, the current message is now
  properly advanced by the 'next' command if it has been printed before.
* If neither the host name nor the user's email address can be determined,
  no Message-ID fields are generated.
* The empty string is now accepted as a message subject for sending.