blkid: optional support for TYPE="fstype"

Adapted from patch created by T4ndeta <t4ndeta@gmail.com>

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/util-linux/volume_id/linux_raid.c b/util-linux/volume_id/linux_raid.c
index e1c8636..761e54f 100644
--- a/util-linux/volume_id/linux_raid.c
+++ b/util-linux/volume_id/linux_raid.c
@@ -75,7 +75,7 @@
 
 	dbg("found raid signature");
 //	volume_id_set_usage(id, VOLUME_ID_RAID);
-//	id->type = "linux_raid_member";
+	IF_FEATURE_BLKID_TYPE(id->type = "linux_raid_member";)
 
 	return 0;
 }