remove clone taskdef

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@278512 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -81,7 +81,6 @@ macrodef=org.apache.tools.ant.taskdefs.MacroDef
 nice=org.apache.tools.ant.taskdefs.Nice
 libraries=org.apache.tools.ant.taskdefs.repository.Libraries
 length=org.apache.tools.ant.taskdefs.Length
-clone=org.apache.tools.ant.taskdefs.Clone
 diagnostics=org.apache.tools.ant.taskdefs.DiagnosticsTask
 
 # optional tasks