[arch-general] Restart systemd related services on update

Hello everybody, on systemd package update systemd.install is run, which calls 'systemctl --system daemon-reexec'. This replaces pid 1 with a new process of updated systemd. However systemd comes with a lot of helper daemons (systemd-udevd, systemd-journald, systemd-logind, ...). These are not restarted. For systemd-213-9 systemd-udevd has a device-mapper fix that takes place only if system is rebooted or 'systemd restart systemd-udevd' is run manually. Any reason this is not done automatically? -- main(a){char*c=/* Schoene Gruesse */"B?IJj;MEH" "CX:;",b;for(a/* Chris get my mail address: */=0;b=c[a++];) putchar(b-1/(/* gcc -o sig sig.c && ./sig */b/42*2-3)*42);}