Try for CI-build: use another tmp.dir

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@835835 13f79535-47bb-0310-9956-ffa450edef68

src/etc/testcases/taskdefs/java.xml

@@ -23,7 +23,8 @@
   <property name="timeToWait" value="4"/>
   <!-- this property gets overridden programmatically-->
   <property name="logFile" value="spawn.log"/>
-  <property name="tmp" location="${java.io.tmpdir}"/>
+  <property name="tmp" location="${java.io.tmpdir}/ant.tmp.java-test"/>
+  <mkdir dir="${tmp}" description="The directory must exist"/>
   <property name="app"
     value="org.apache.tools.ant.taskdefs.JavaTest$$EntryPoint" />