lvm2: fixed to only enable synchronisation with udev processing if the udev package is effectively installed

base/lvm2/lvm2.conf

@@ -57,7 +57,7 @@ var_append extraconfopt ' ' '--enable-cmdlib'
 var_append extraconfopt ' ' '--enable-dmeventd'
 
 # enable synchronisation with udev processing
-if pkginstalled udev; then
+if pkginstalled -f udev; then
 	var_append extraconfopt ' ' '--enable-udev_sync'
 	# install rule files needed for udev synchronisation
 	var_append extraconfopt ' ' '--enable-udev_rules'