systemd-serialgetty: Update to match version in recent systemd

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
systemd-compat-units: Mask out most of initscripts

Is systemd is installed, we don't want to run most of the initscripts
package since systemd does these itself. THis patch therefore masks
out the functionality which isn't needed.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>