Partially fix carla-bridges build

c++/carla-backend/lv2.cpp

@@ -1201,7 +1201,11 @@ public:
 
     void idleGui()
     {
+#ifdef BUILD_BRIDGE
+        const bool haveUI = (gui.type != GUI_EXTERNAL_OSC && ui.handle && ui.descriptor);
+#else
         const bool haveUI = (gui.type == GUI_EXTERNAL_OSC && osc.data.target) || (ui.handle && ui.descriptor);
+#endif
 
         if (haveUI)
         {

c++/carla-bridge/carla_bridge_plugin.cpp

@@ -540,7 +540,7 @@ public:
 #endif
     }
 
-    CarlaBackend::GuiDataHandle getWindowHandle() const
+    QDialog* getWindowHandle() const
     {
         return dialog;
     }