Talked about the nested arg element and forgot to include it, tss.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@267803 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/ExecTask.java

@@ -110,6 +110,10 @@ public class ExecTask extends Task {
         env.addVariable(var);
     }
 
+    public Commandline.Argument createArg() {
+        return cmdl.createArgument();
+    }
+
     public void execute() throws BuildException {
         if (cmdl.getExecutable() == null) {
             throw new BuildException("no executable specified", location);