Limit recursiveness during the library loading process

Author: MatteoPologruto

arduino/libraries/loader.go

@@ -184,7 +184,9 @@ func addExamplesToPathList(examplesPath *paths.Path, list *paths.PathList) error
 		_, err := sketch.New(file)
 		if err == nil {
 			list.Add(file)
-		} else if file.IsDir() {
+		} else if isDir, err := file.IsDirCheck(); err != nil {
+			return err
+		} else if isDir {
 			if err := addExamplesToPathList(file, list); err != nil {
 				return err
 			}