units: add missing unit file

units/var-lib-machines.mount

@@ -0,0 +1,16 @@
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+
+[Unit]
+Description=Virtual Machine and Container Storage
+ConditionPathExists=/var/lib/machines.raw
+
+[Mount]
+What=/var/lib/machines.raw
+Where=/var/lib/machines
+Type=btrfs
+Options=loop