bugfix: on borderless map, can't fire disable unit if destroyer is on noth and target on south
bugfix: on borderless map, can't fire disable unit if destroyer is on noth and target on south

google-code-export/fullmetalgalaxy,google-code-export/fullmetalgalaxy,google-code-export/fullmetalgalaxy,google-code-export/fullmetalgalaxy,google-code-export/fullmetalgalaxy