Configure systemd sysv-compat for LSB compliance

[DJ Lucas]

1. Create a "install-systemd" target in the LFS-Bootscripts package to provide SysV compat directory layout and install /lib/lsb/init-functions
2. Create a lsb-facilities "bootscript" for systemd that does nothing but exit(0) and provide all of the required LSB facilities. Link to /etc/rc.d/rcS.d/S00lsb-facilities and /etc/rc.d/rc{0,6}/K99lsb-facilities (make Required-Start: $first, and Required-Stop: $last).
3. Preferably, install this with the systemd package in LFS (not BLFS) so the existing note can remain without further complicating BLFS.

[DJ Lucas]

On second thought, this could be configured in BLFS with the blfs-systemd-units package. There is some risk of divergence, but it's minimal (when was the last time that init-functions was updated?). Just need a para to install from LSB-Tools package in BLFS-systemd.

[Douglas R. Reno]

DJ, do you think this would be more efficient in BLFS or LFS?

[Douglas R. Reno]

I'll drop this into BLFS systemd units, but I'd like to make it fully optional. I've been meaning to look into the PID problems in lightdm anyway that I spotted around 9.0's release cycle (but long after the package was tagged).

[Douglas R. Reno]

At this point, let's mark this as a "Nice to have", until DJ is ready to take care of this

[Xi Ruoyao]

Change it to overcomebyevents because this feature is deprecated in systemd 254 and will be removed from systemd.