Jenkins DSL: Add a workaround to run "ant init" before building with Gradle

Otherwise the Ant-helpers are not compiled properly currently

We should remove this as soon as Gradle build is working standalone

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1888450 13f79535-47bb-0310-9956-ffa450edef68
1 file changed