Update to the 4 April version of the maildir patch which has the
following fixes:

Fixed several bugs reported by Dan Pollock and Michael Anttila,
also added some improvements.

1. Crash when a symbolic link in the new/ directorry exists.
2. Do not update status of messages when viewing messages with full headers.
3. Pine offers to remove messages in pruned-folders, instead of the folder to be pruned.
4. New algorithm for rescaning a folder when there have been changes.