Remove unused vairable.

include/aidge/utils/Registrar.hpp

@@ -59,7 +59,7 @@ struct Registrar {
 
     Registrar(const registrar_key& key, registrar_type func) {
         //printf("REGISTRAR: %s\n", key.c_str());
-        bool newInsert;
+        // bool newInsert;
         // std::tie(std::ignore, newInsert) = C::registry().insert(std::make_pair(key, func));
         C::registry().erase(key);
         C::registry().insert(std::make_pair(key, func));