xlsx is expected to fail in integration test

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1867493 13f79535-47bb-0310-9956-ffa450edef68

src/integrationtest/org/apache/poi/TestAllFiles.java

@@ -276,6 +276,7 @@ public class TestAllFiles {
         "spreadsheet/CustomXMLMapping-singleattributenamespace.xlsx",
         "spreadsheet/55864.xlsx",
         "spreadsheet/57890.xlsx",
+        "spreadsheet/xxe_in_schema.xlsx",
 
         // TODO: these fail now with some NPE/file read error because we now try to compute every value via Cell.toString()!
         "spreadsheet/44958.xls",