XML: allowing to remove the property $text for XMLNode.

Author: xeioex

external/njs_xml_module.c

@@ -370,6 +370,7 @@ static njs_external_t  njs_ext_xml_node[] = {
         .name.string = njs_str("$text"),
         .enumerable = 1,
         .writable = 1,
+        .configurable = 1,
         .u.property = {
             .handler = njs_xml_node_ext_text,
         }