Carla: Fix loading projects with internal plugins

c++/carla-backend/carla_native.cpp

@@ -1583,6 +1583,11 @@ public:
 
     bool init(const char* const name, const char* const label)
     {
+        // ---------------------------------------------------------------
+        // initialize native-plugins descriptors
+
+        scopedInitliazer.maybeFirstInit();
+
         // ---------------------------------------------------------------
         // get descriptor that matches label