Fix compile

Change-Id: I4ea7d0f8c8809496c04f1bbe266eb722f999209e
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/qbsprojectmanager/qbsnodes.h

@@ -172,6 +172,7 @@ public:
     const qbs::Project qbsProject() const;
     const qbs::ProjectData qbsProjectData() const;
 
+    bool showInSimpleTree() const;
 private:
     void ctor();