[WFLY-14711] In WildFly Preview enable use an alternate XJC variant
[WFLY-14711] In WildFly Preview enable use an alternate XJC variant

wildfly/wildfly,jstourac/wildfly,pferraro/wildfly,pferraro/wildfly,jstourac/wildfly,wildfly/wildfly,iweiss/wildfly,pferraro/wildfly,iweiss/wildfly,rhusar/wildfly,jstourac/wildfly,rhusar/wildfly,iweiss/wildfly,wildfly/wildfly,rhusar/wildfly,pferraro/wildfly,rhusar/wildfly,wildfly/wildfly,iweiss/wildfly,jstourac/wildfly