Fix not to rely on which, or the scriptlets will fail on EL 10 systems

setup.sh

@@ -662,7 +662,7 @@ if [ ! -f "$config_dir/.pre-install" ]; then
 fi
 
 # Test if we have systemd system
-systemctlcmd=$(which systemctl 2>/dev/null)
+systemctlcmd=$(command -v systemctl 2>/dev/null || :)
 if [ -x "$systemctlcmd" ]; then
     initsys=$(cat /proc/1/comm 2>/dev/null)
     if [ "$initsys" != "systemd" ]; then