Explicitly depend on the preferred java runtime
    
    F19 has two openjdk packages available, 1.7.0 and 1.8.0. To make sure
    the yum depsolver only drags in the preferred one (and not both!)
    depend explicitly on 'java' which is only provided by the preferred
    runtime.
    
    This is also recommended practice by the Fedora Java packaging docs.
    
    https://bugzilla.redhat.com/show_bug.cgi?id=949106