Merged the solution of PR 15390 (choice of regular expression implementation)

into ANT_16_BRANCH


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@276778 13f79535-47bb-0310-9956-ffa450edef68

WHATSNEW

@@ -23,9 +23,6 @@ Other changes:
 * <echoproperties> now (alphanumerically) sorts the property list
   before echoing, when you request XML output (format="xml"). 
 
-* Enable to choose the regexp implementation without system property.
-  Bugzilla Report 15390.
-
 * Changed default tempdir for <javac> from user.dir to java.io.tmpdir.
 
 * A new base class DispatchTask has been added to facilitate elegant 
@@ -55,6 +52,9 @@ Other changes:
 * Javadoc fixes for Location, Project, and RuntimeConfigurable
   Bugzilla 30160.
 
+* Enable to choose the regexp implementation without system property.
+  Bugzilla Report 15390.
+
 Fixed bugs:
 -----------