Upgrade to Drupal 7 fails if CTools not enabled

When following the recommended upgrade path (disable all contrib modules, upgrade core alone, upgrade contrib modules), Strongarm encounters an error in strongarm_update_7201(). This is because neither Strongarm nor Ctools are enabled yet, but the upgrade functions still need to be executed. To fix this we simply need to add:

module_load_include('module', 'ctools');

At the top of the update function, similar to the include we already have for Strongarm.

Related issue #1345328: Error when running updb