content_admin.inc file is inproperly referenced in include_once of date.install

While doing a 5.x-2.x-dev install I got an error about a missing include file. The line of code in date/date/date.install on line #8:

  include_once('./'. drupal_get_path('module', 'content') .'/includes/content_admin.inc');

Looking in the content (cck) directory I found the content_admin.inc under the parent folder and not under an includes folder. To get the install to run properly I replaced the above line with:

  include_once('./'. drupal_get_path('module', 'content') .'/content_admin.inc');

Unfortunately I don't know which version of CCK the folder structure changed but I am currently using 5.x-1.7.