Kerning is just another font feature and is already handled by the
layout engine, there is nothing special about it.

Non of this seems to be used anywhere, anyway.

Change-Id: Ia40c66ec186d11ab46d5d5256b09307a319318c0
Reviewed-on: https://gerrit.libreoffice.org/6259Reviewed-by: Tor Lillqvist <tml@collabora.com>
Tested-by: Tor Lillqvist <tml@collabora.com>