Make the generic installer build work with Maven 2.0.x (it works fine with 2.1.x).
Make the generic installer build work with Maven 2.0.x (it works fine with 2.1.x).

git-svn-id: cf27bad30c6b7316185bdac65b014e8c16cd40b6@11724 f329d543-caf0-0310-9063-dda96c69346f

xwiki/xwiki-enterprise,xwiki/xwiki-enterprise