blkid: add bcache support

URL: https://bugs.gentoo.org/508596
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/util-linux/volume_id/volume_id.c b/util-linux/volume_id/volume_id.c
index 5c459a0..3f71e00 100644
--- a/util-linux/volume_id/volume_id.c
+++ b/util-linux/volume_id/volume_id.c
@@ -107,6 +107,9 @@
 #if ENABLE_FEATURE_VOLUMEID_XFS
 	volume_id_probe_xfs,
 #endif
+#if ENABLE_FEATURE_VOLUMEID_BCACHE
+	volume_id_probe_bcache,
+#endif
 };
 
 /* fill buffer with maximum */