Duplicate package names in orm/engine, causes problem with jdk9 modules

Description

Causes problem with jdk9 modules, any module-info.java that requires classes in both engine/orm

module anymodule {
requires hibernate.search.engine;
requires hibernate.search.orm;
}

Will fail with
org.hibernate.search.backend.impl from both hibernate.search.orm and hibernate.search.engine
org.hibernate.search.engine.impl from both hibernate.search.orm and hibernate.search.engine
org.hibernate.search.jmx.impl from both hibernate.search.orm and hibernate.search.engine