build spotbugs in jenkins build

git-svn-id: https://svn.apache.org/repos/asf/xmlbeans/trunk@1880974 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/build.xml b/build.xml
index baf2a76..aaf4a47 100644
--- a/build.xml
+++ b/build.xml
@@ -766,7 +766,7 @@
 
     <!-- forbidden-apis-check is currently not included as it is still failing... -->
     <target name="jenkins"
-            depends="test,package,rat-check"
+            depends="test,package,rat-check,findbugs"
             description="Combines all targets that are executed in CI runs"/>