added dummy libsimaka_init() function needed for integrity testing

src/libsimaka/simaka_manager.h

@@ -278,6 +278,11 @@ struct simaka_manager_t {
 	void (*destroy)(simaka_manager_t *this);
 };
 
+/**
+ * Dummy libsimaka initialization function needed for integrity test
+ */
+void libsimaka_init(void);
+
 /**
  * Create an SIM/AKA manager to handle multiple (U)SIM cards/providers.
  *