Refer to PSA-2011-02., we should remove examples folder in plupload library in order to avoid security risk as stated in
In order to include plupload module into Drupal distribution, e.g. DruStack, we need a patch file for drush make so can remove examples folder by patching the library.
This issue should be considered Fixed due to the recommended patch not being one that can be applied to the repo. If a search has lead you here there is a plupload.make.example file in the module. This should be applied to your local make file and applied thus (assuming your .make file is called build.make);
drush make --no-core --libraries=plupload build.make