hint that we are not using a globally installed dlib

Author: pfeatherstone

benchmarks/dlibqueue.h

@@ -1,7 +1,7 @@
 #pragma once
 
 #include <utility>
-#include <dlib/pipe.h>
+#include "dlib/pipe.h"
 #include "wrappers.h"
 
 template<typename T>
@@ -36,4 +36,4 @@ struct DlibQueueWrapper
 
 private:
     dlib::pipe<T> q;
-};
+};