workaround for an out-of-date tinyxml2 version

examples/Importers/ImportMJCFDemo/BulletMJCFImporter.cpp

@@ -241,7 +241,11 @@ struct BulletMJCFImporterInternalData
 		return buf;
 #else
 		char row[1024];
+#ifdef G3_TINYXML2
+		sprintf(row,"unknown line, upgrade tinyxml2 version!");
+#else
 		sprintf(row,"%d",e->GetLineNum());
+#endif
 		std::string str = m_sourceFileName.c_str() + std::string(":") + std::string(row);
 		return str;
 #endif
@@ -1491,8 +1495,12 @@ bool BulletMJCFImporter::parseMJCFString(const char* xmlText, MJCFErrorLogger* l
 	xml_doc.Parse(xmlText);
 	if (xml_doc.Error())
 	{
+#ifdef G3_TINYXML2
+		logger->reportError("xml reading error (upgrade tinyxml2 version!");
+#else
 		logger->reportError(xml_doc.ErrorStr());
 		xml_doc.ClearError();
+#endif
 		return false;
 	}