Always write cxxbridge.h into a predictable place from build script
diff --git a/demo-cxx/demo.h b/demo-cxx/demo.h
index 51dd81b..417edfb 100644
--- a/demo-cxx/demo.h
+++ b/demo-cxx/demo.h
@@ -1,5 +1,5 @@
 #pragma once
-#include "../include/cxxbridge.h"
+#include "cxxbridge/cxxbridge.h"
 #include <memory>
 #include <string>