testing/dar: upgrade to 2.6.14
https://sourceforge.net/p/dar/mailman/message/37239553/
from 2.6.13 to 2.6.14
- script used to build dar windows binary has been fixed to have the official default etc/darrc config file usable and used out of the box.
- fixed bug met when removing slices of an old backup located on a remote sftp server
- fixed bug in cache layer met when writing sliced backup to a remote ftp or sftp repository
- enhancement to the -[ and -] options to work as expected when "DOS" formatted text file is provided as a file listing.