exploded-image-optimize touches module-info.class in all modules

Due to the current design of the AddPackagesAttribute build tool, all module-info.class files will be written to, when the tool is run. This happens whenever at least one module-info.class file has been updated. The end result of this is that if you recompile a single module, *all* modules will be touch, forcing jmod to repackage all of them.