Disable some exprtk options

Disabling some of expression parser exprtk parsing options to reduce
image size.

Signed-off-by: Vijay Khemka <vijaykhemka@fb.com>
Change-Id: Ie4beea72231fea343f6e216ed7476d3eafb0bb97
diff --git a/virtualSensor.hpp b/virtualSensor.hpp
index b632e15..0e000e9 100644
--- a/virtualSensor.hpp
+++ b/virtualSensor.hpp
@@ -1,5 +1,5 @@
 #include "dbusSensor.hpp"
-#include "exprtk.hpp"
+#include "exprtkTools.hpp"
 
 #include <nlohmann/json.hpp>
 #include <sdbusplus/bus.hpp>