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

WHATSNEW

@@ -23,6 +23,10 @@ Fixed bugs:
    representing a @Parameterized JUnit4 test wasn't being reported in the XML.
    Bugzilla Report 64952
 
+ * 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
+
 Other changes:
 --------------
 

build.xml

@@ -980,7 +980,7 @@
           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"/>