Function zone_into_building_unidir

library/modules/Buildings.cpp:189–194

}

static void zone_into_building_unidir(df::building* bld, df::building_civzonest* zone)
{
    if (linear_index(bld->relations, zone) >= 0)
        return;
    bld->relations.push_back(zone);
}

static bool is_suitable_building_for_zoning(df::building* bld)
{