Fix build

Change-Id: Iecf880efd160c5e3006517b9ab896ef90cefe930
diff --git a/Android.mk b/Android.mk
index 83a17ed..50c8ddc 100644
--- a/Android.mk
+++ b/Android.mk
@@ -91,7 +91,7 @@
   zone.cpp
 
 LOCAL_C_INCLUDES:= \
-	system/media/wilhelm/include
+	$(call include-path-for, wilhelm)
 
 LOCAL_SHARED_LIBRARIES := \
 	libutils \