Changed default tempdir to java.io.tmpdir instead of user.dir.

PR: 29391, 4590


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@276532 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTasks/javac.html

@@ -344,8 +344,9 @@ invoking the compiler.</p>
       This is only used if the task is forked and the
       command line args length exceeds 4k.
       <em>Since Ant 1.6</em>.</td>
-    <td align="center" valign="top">No; default is the current working
-       directory.</td>
+    <td align="center" valign="top">
+      No; default is <i>java.io.tmpdir</i>.
+    </td>
   </tr>
 </table>