devicemapper: Create a method to get device info with deferred remove field

Deferred reove functionality was added to library later. So in old version
of library it did not report deferred_remove field. 

Create a new function which also gets deferred_remove field and it will be
called only on newer version of library. 

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>

pkg/devicemapper/devmapper_wrapper_no_deferred_remove.go

@@ -8,3 +8,7 @@ func dmTaskDeferredRemoveFct(task *CDmTask) int {
 	// Error. Nobody should be calling it.
 	return -1
 }
+
+func dmTaskGetInfoWithDeferredFct(task *CDmTask, info *Info) int {
+	return -1
+}