Fix NCDFE 'org.w3c.dom.ElementTraversal' in standalone-jps by adding necessary jars to package.

Problem introduced on Jan 26 in commit 6ff87c6 (IDEA-CR-17756)

build/scripts/layouts.gant

@@ -93,6 +93,7 @@ def layoutJps(String home, String targetDir, String buildNumber, Closure additio
         include(name: "netty-all-*.jar")
         include(name: "snappy-in-java-*.jar")
         include(name: "xercesImpl.jar")
+        include(name: "xml-apis.jar")
       }
       fileset(dir: "$home/jps/lib") {
         include(name: "optimizedFileManager.jar")