set headless

git-svn-id: svn+ssh://svn.internal.sanger.ac.uk/repos/svn/pathsoft/artemis/trunk@15736 ee4ac58c-ac51-4696-9907-e4b3aa274f04

test/build-test.xml

@@ -83,6 +83,7 @@
   	<echo>Running test with EMBOSS_ROOT=${EMBOSS_ROOT}</echo>
   	<junit description="alltests" fork="yes">
   	 <jvmarg value="-DEMBOSS_ROOT=${EMBOSS_ROOT}"/>
+     <jvmarg value="-Djava.awt.headless=true"/>
   	 <batchtest todir="${build.dest.tests}">
   	 	<fileset dir="${build.src.tests}">
   	 		<include name="uk/ac/sanger/artemis/**/**Test.java"/>