Register new extension types

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@272604 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/types/defaults.properties

@@ -12,3 +12,5 @@ patternset=org.apache.tools.ant.types.PatternSet
 regexp=org.apache.tools.ant.types.RegularExpression
 substitution=org.apache.tools.ant.types.Substitution
 xmlcatalog=org.apache.tools.ant.types.XMLCatalog
+extensionSet=org.apache.tools.ant.taskdefs.optional.extension.ExtensionSet
+extension=org.apache.tools.ant.taskdefs.optional.extension.ExtensionAdapter