Unbreak antcall stuff

Change-Id: Ie7d1ef8d3b76d46466b178c3b9d59f205611a64a
Reviewed-on: http://gerrit.dmdirc.com/794
Reviewed-by: Shane Mc Cormack <shane@dmdirc.com>
Automatic-Compile: Shane Mc Cormack <shane@dmdirc.com>

build-tests.xml

@@ -90,9 +90,9 @@
 
     <target name="-test-no-xvfb" unless="use.xvfb">
         <antcall>
-            <target>with.clover</target>
-            <target>do-real-test</target>
-            <target>clover.snapshot</target>
+            <target name="with.clover"/>
+            <target name="do-real-test"/>
+            <target name="clover.snapshot"/>
         </antcall>
     </target>