Support .drush-ignore-update in make files

I think it would make sense to support the new lock feature in Drush (see #446736: Have drush update be told to ignore a module/theme -- simple solution). By support I mean that Drush Make should be able to put a .drush-ignore-update file in place for downloaded projects.

projects[views][version] = "2.11"
projects[views][lock] = "1"
projects[views][lock_message] = "Locked from update due to patch"
projects[views][patch][] = "http://drupal.org/files/issues/something.patch"

As said, this would put in place the .drush-ignore-update with the optional lock message in that file.