TraX support should be optional!

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@268395 13f79535-47bb-0310-9956-ffa450edef68

build.xml

@@ -66,6 +66,8 @@
     <available property="netrexx.present" classname="netrexx.lang.Rexx" />
     <available property="xslp.present" 
                classname="com.kvisco.xsl.XSLProcessor" />
+    <available property="trax.present" 
+               classname="javax.xml.transform.Transformer" />
     <available property="xalan.present" 
                classname="org.apache.xalan.xslt.XSLTProcessorFactory" />
     <available property="ejb.ejbc.present" classname="weblogic.ejbc" />
@@ -146,6 +148,7 @@
       <exclude name="**/NetRexxC.java" unless="netrexx.present" />
       <exclude name="**/XslpLiaison.java" unless="xslp.present" />
       <exclude name="**/XalanLiaison.java" unless="xalan.present" />
+      <exclude name="**/TraXLiaison.java" unless="trax.present" />
       <exclude name="**/Ejbc*.java" unless="ejb.ejbc.present" />
       <exclude name="**/DDCreator*.java" unless="ejb.DDCreator.present" />
       <exclude name="**/WLRun.java" unless="ejb.wls.present" />