Make it compatible with latest mkinitcpio.

Latest init script mounts a /dev FS, so /dev/loop0 will disappear.
Create loop0 on /lib/udev/devices so udev copy to /dev on startup.

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>

archiso/install/archiso

@@ -14,7 +14,7 @@ install ()
     add_dir /tmpfs.sqfs
     add_dir /bootmnt
 
-    add_device /dev/loop0 b 7 0
+    add_device /lib/udev/devices/loop0 b 7 0
 
     add_binary /lib/udev/cdrom_id