only try to use lv2 modgui under linux

source/utils/CarlaLv2Utils.hpp

@@ -2776,7 +2776,9 @@ const LV2_RDF_Descriptor* lv2_rdf_new(const LV2_URI uri, const bool loadPresets)
     // ----------------------------------------------------------------------------------------------------------------
     // Set Plugin UIs
     {
+#ifdef CARLA_OS_LINUX
         const bool hasMODGui(lilvPlugin.get_modgui_resources_directory().as_uri() != nullptr);
+#endif
 
         Lilv::UIs lilvUIs(lilvPlugin.get_uis());