Like on other common desktop Linux distributions, ship an /sbin/mount.ntfs
symlink in addition to the /sbin/mount.ntfs-3g one in order to let wrapper
programs successfully call external mount helpers by the filesystem name.

The assumption is that /sbin/mount.ntfs is only ever called by util-linux
mount and other mount-wrappers when kernel NTFS support is not available,
means shipping the additional symlink will not interfere with kernel mode
NTFS support.

This commit is mainly intended to prepare transparent fs-tools support for
mounting fuse filesystems, with focus on ntfs-3g in particular.

Please see http://git.lede-project.org/f027c68 for the corresponding
fs-tools support code.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>