fuse-exfat, ntfs-3g-ntfsprogs: Move util-linux-mount to RRECOMMENDS

Soften the dependency to allow distros to use another mount provider
like busybox instead of being forced to use util-linux-mount.

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>