switch to makefile instead, reuse threads

src/model.h

@@ -6,7 +6,7 @@ struct model : genericModel {
   VoskModel* mdl{};
   model(const std::string& storepath, const std::string& id, int index);
   bool checkModel();
-  void afterFetch(int addr, size_t size);
+  void afterFetch();
   void load(bool newThrd);
   ~model();
 };