include: Add missing defines to mddk.h.
diff --git a/include/mmddk.h b/include/mmddk.h
index f7e260f..17366db 100644
--- a/include/mmddk.h
+++ b/include/mmddk.h
@@ -89,6 +89,8 @@
 #define DRV_QUERYSTRINGID		(DRV_RESERVED + 14)
 #define DRV_QUERYSTRINGIDSIZE		(DRV_RESERVED + 15)
 #define DRV_QUERYIDFROMSTRINGID		(DRV_RESERVED + 16)
+#define DRV_QUERYFUNCTIONINSTANCEID	(DRV_RESERVED + 17)
+#define DRV_QUERYFUNCTIONINSTANCEIDSIZE	(DRV_RESERVED + 18)
 #ifdef __WINESRC__
 #define DRV_QUERYDSOUNDIFACE		(DRV_RESERVED + 20)
 #define DRV_QUERYDSOUNDDESC		(DRV_RESERVED + 21)