build: fix compile warning

Change-Id: Ic698231c25a47d27c15d0c43b6fd777086f991b6
diff --git a/src/digest-tree-scene.cpp b/src/digest-tree-scene.cpp
index 65204df..a253384 100644
--- a/src/digest-tree-scene.cpp
+++ b/src/digest-tree-scene.cpp
@@ -349,5 +349,5 @@
 
 #if WAF
 #include "digest-tree-scene.moc"
-#include "digest-tree-scene.cpp.moc"
+// #include "digest-tree-scene.cpp.moc"
 #endif