Moved execon to deprecated section

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@292982 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -36,7 +36,6 @@ touch=org.apache.tools.ant.taskdefs.Touch
 signjar=org.apache.tools.ant.taskdefs.SignJar
 genkey=org.apache.tools.ant.taskdefs.GenerateKey
 antstructure=org.apache.tools.ant.taskdefs.AntStructure
-execon=org.apache.tools.ant.taskdefs.ExecuteOn
 antcall=org.apache.tools.ant.taskdefs.CallTarget
 sql=org.apache.tools.ant.taskdefs.SQLExec
 mail=org.apache.tools.ant.taskdefs.email.EmailTask
@@ -220,3 +219,4 @@ rename=org.apache.tools.ant.taskdefs.Rename
 WsdlToDotnet=org.apache.tools.ant.taskdefs.optional.dotnet.WsdlToDotnet
 style=org.apache.tools.ant.taskdefs.XSLTProcess
 copypath=org.apache.tools.ant.taskdefs.CopyPath
+execon=org.apache.tools.ant.taskdefs.ExecuteOn