replace using with scoped typedef as in propertyfilter
diff --git a/src/main/include/log4cxx/filter/mapfilter.h b/src/main/include/log4cxx/filter/mapfilter.h
index 2745344..f4653e0 100644
--- a/src/main/include/log4cxx/filter/mapfilter.h
+++ b/src/main/include/log4cxx/filter/mapfilter.h
@@ -32,10 +32,10 @@
  * A Filter that operates on a Map.
  */
 
-using KeyValList = std::map<LogString, LogString>;
-
 class LOG4CXX_EXPORT MapFilter: public log4cxx::spi::Filter
 {
+	typedef std::map < LogString, LogString > KeyValList;
+
 	private:
 		bool acceptOnMatch = true;
 		bool mustMatchAll = false;  // true = AND; false = OR