Remove obsolete lack of bxor support for Postgres
Remove obsolete lack of bxor support for Postgres

Follow up to #1673, allowing it to be tested.

fredericDelaporte/nhibernate-core,nhibernate/nhibernate-core,ngbrown/nhibernate-core,nhibernate/nhibernate-core,nhibernate/nhibernate-core,gliljas/nhibernate-core,nhibernate/nhibernate-core,ngbrown/nhibernate-core,ngbrown/nhibernate-core,hazzik/nhibernate-core,RogerKratz/nhibernate-core,RogerKratz/nhibernate-core,fredericDelaporte/nhibernate-core,fredericDelaporte/nhibernate-core,gliljas/nhibernate-core,RogerKratz/nhibernate-core,hazzik/nhibernate-core,fredericDelaporte/nhibernate-core,RogerKratz/nhibernate-core,gliljas/nhibernate-core,gliljas/nhibernate-core,hazzik/nhibernate-core,hazzik/nhibernate-core