Split libdevmapper off into separate package

Makefile.libdevmapper

@@ -0,0 +1,18 @@
+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation here:
+# (http://www.gnu.org/licenses/gpl-2.0.html)
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+DEPENDS = 
+REPO = main
+BRIEF = The device mapper userspace library
+DESC = The Device-mapper is a component of the linux kernel \
+(since version 2.6) that supports logical volume management. \
+It is required by LVM2 and EVMS
+
+include /usr/share/snap/Makefile.snaplinux