Log Message:
Update mail-notification to 5.4

pkgsrc changes: patch to use gmime24

Changes since 5.3:
* The regression which caused some read IMAP messages to be reported as
  unread has been fixed.
* And more, see the NEWS file.
Changes since 5.2:
* A crash affecting IMAP, Maildir and POP3 mailboxes has been fixed.
* A crash affecting Evolution mailboxes on 64-bit systems has been fixed.
* And more, see the NEWS file.
Changes since 5.1:
* Default configuration values were not registered.
Changes since 5.0:
* A number of minor issues have been fixed. Most notably, the message
  count is now drawn properly.
* And more, see the NEWS file.