missing: Add DM_DEFERRED_REMOVE

Also include missing.h in dissect-image.c to pick it up.

src/basic/missing.h

@@ -593,6 +593,10 @@ struct btrfs_ioctl_quota_ctl_args {
 #define SMACK_MAGIC 0x43415d53
 #endif
 
+#ifndef DM_DEFERRED_REMOVE
+#define DM_DEFERRED_REMOVE (1 << 17)
+#endif
+
 #ifndef MAX_HANDLE_SZ
 #define MAX_HANDLE_SZ 128
 #endif

src/shared/dissect-image.c

@@ -38,6 +38,7 @@
 #include "hostname-util.h"
 #include "id128-util.h"
 #include "linux-3.13/dm-ioctl.h"
+#include "missing.h"
 #include "mount-util.h"
 #include "path-util.h"
 #include "process-util.h"