volume_id: add exFAT detection

function                                             old     new   delta
volume_id_probe_exfat                                  -     294    +294

Signed-off-by: S-G Bergh <sgb@systemasis.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/util-linux/volume_id/volume_id.c b/util-linux/volume_id/volume_id.c
index c1d6152..3c3c698 100644
--- a/util-linux/volume_id/volume_id.c
+++ b/util-linux/volume_id/volume_id.c
@@ -93,6 +93,9 @@
 #if ENABLE_FEATURE_VOLUMEID_FAT
 	volume_id_probe_vfat,
 #endif
+#if ENABLE_FEATURE_VOLUMEID_EXFAT
+	volume_id_probe_exfat,
+#endif
 #if ENABLE_FEATURE_VOLUMEID_MAC
 	volume_id_probe_mac_partition_map,
 #endif