systemd: Remove manual symlink creation

It looks like, systemd does it for us now with the script
`tools/meson-make-symlink.sh`. No idea, why it wasn’t the case in
systemd 237.

```
[BEE] => entering mee_install_post() ..
mkdir: cannot create directory ‘/dev/shm/bee-root/systemd/systemd-238-0/image/sbin’: File exists
```

systemd.be0

@@ -81,12 +81,6 @@ mee_configure() {
 ## by default this may be 'make install DESTDIR="${D}"'
 
 mee_install_post() {
-    mkdir ${D}/sbin
-    for tool in runlevel reboot shutdown poweroff halt telinit; do
-        ln -sv ../bin/systemctl ${D}/sbin/${tool}
-    done
-    ln -sv ../lib/systemd/systemd ${D}/sbin/init
-
     # Support Linux kernels built with `CONFIG_CMDLINE="init=/bin/systemd"`
     ln -v ${D}/lib/systemd/systemd ${D}/bin/systemd