Set plugin dummy flag if RUNNING_UNDER_LV2LINT env var is set

distrho/src/DistrhoPluginLV2.cpp

@@ -1486,6 +1486,9 @@ static LV2_Handle lv2_instantiate(const LV2_Descriptor*, double sampleRate, cons
     d_nextBundlePath = bundlePath;
     d_nextCanRequestParameterValueChanges = ctrlInPortChangeReq != nullptr;
 
+    if (std::getenv("RUNNING_UNDER_LV2LINT") != nullptr)
+        d_nextPluginIsDummy = true;
+
     return new PluginLv2(sampleRate, uridMap, worker, ctrlInPortChangeReq, usingNominal);
 }