bz-65110 Fix the ant-testutil-sources.jar generation

WHATSNEW

@@ -1,6 +1,14 @@
 Changes from Ant 1.9.15 TO Ant 1.9.16
 =====================================
 
+Fixed bugs:
+-----------
+
+ * Fixes a bug where the ant-testutil-sources.jar that gets published to Maven
+   central repository didn't contain any source files.
+   Bugzilla Report 65110
+
+
 Changes from Ant 1.9.14 TO Ant 1.9.15
 =====================================
 

build.xml

@@ -864,7 +864,7 @@
           description="--> creates the Apache Ant Test Utilities source jar">
     <mkdir dir="${build.lib-src}"/>
     <jar destfile="${build.lib-src}/${name}-testutil.jar"
-         basedir="${java.dir}">
+         basedir="${src.junit}">
       <patternset refid="useful.tests"/>
       <metainf dir="${build.dir}">
         <include name="LICENSE.txt"/>