libass: update to libass-0.11.1

Signed-off-by: Stephan Raue <stephan@openelec.tv>
ethtool: update to ethtool-3.13

Signed-off-by: Stephan Raue <stephan@openelec.tv>
libnfs: update to libnfs-1.9.3

Signed-off-by: Stephan Raue <stephan@openelec.tv>