proposed fix for #2588

ref #2588
as title says

an exfat partition here is auto-mounted now, and I also can mount/umount it by udevil or "mount"

fuse-exfat bump is not important but nice-to-have

as a side note I would say that fuse-exfat is very unstable to me. mount.exfat crashes often here resulting in "Transport endpoint is not connected" errors. IMO using this fs should be discouraged or not even supported. 

EDIT:  "Transport endpoint is not connected" is caused not by exfat crash, but by udev. basicaly it is not designed to run long-living tasks. so mounting *fuse* via udev is a bit tricky. don't merge this PR yet.