title: Mapstruct ignore method generation
body: <p>Is there a way to ignore the generation of the mapper for the 3rd method in this code sample using mapstruct?</p>
  
  <pre><code>@Mapper(unmappedSourcePolicy = ReportingPolicy.IGNORE, unmappedTargetPolicy = ReportingPolicy.IGNORE)
  public interface EmployeeMapper {
  
     EmployeeMapper MAPPER = Mappers.getMapper( EmployeeMapper.class );
  
     @Mapping(source = "id", target = "id")
     @Mapping(source = "firstName", target = "firstname")
     @Mapping(source = "surname", target = "surname")
     @Mapping(source = "employmentses", target = "employmentDTOList")
     EmployeeDTO employee2dto(Employees employees);
  
     @Mapping(source = "id", target = "id")
     @Mapping(source = "firstName", target = "firstname")
     @Mapping(source = "surname", target = "surname")
     @Mapping(target = "employmentDTOList", ignore = true)
     EmployeeDTO domainView2dto(EmployeeView employeeView);
  
     //to be ignored by Mapstruct
     EmployeePageDTO domainPage2dto(Page&lt;EmployeeView&gt; employeeViewPage);
  
  }
  </code></pre>