sysutils/automount: update to 1.7.9

• Fix XORG detection.
• Implement proposed BLACKLIST_REGEX option.
• Use 'sysutils/fusefs-lkl' for all ext2/ext3/ext4 mounts.
• Fix exFAT detection.
• Fix small problem with checking the mount state.
• Implement better old directory cleanup.

PR: 273314
Reported by: vermaden@interia.pl (maintainer)