drupal_path_initialize() should not call drupal_get_normal_path() when run from cron.php.

• Create a new Drupal-7 site using the latest git checkout code.
• Install a module that implements hook_url_inbound_alter() to redirect to canonical urls.
• Visit the admin/reports/status page and copy the cron url into a crontab task.
• Visit the admin/config/system/site-information page and set the Default front page to something other than node.
• Discover the following sequence:
  • cron.php calls drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL)
  • drupal_bootstrap() calls _drupal_bootstrap_full()
  • _drupal_bootstrap_full() calls drupal_path_initialize()
  • drupal_path_initialize() calls drupal_get_normal_path(variable_get('site_frontpage', 'node'))
  • drupal_get_normal_path() invokes hook_url_inbound_alter
  • The redirect module calls drupal_goto() to redirect to the <front>
• Result: cron functions never run, and my mailbox gets filled up with copies of the homepage.

Patched the redirect module to work around the core bug in #905914-26: Merge global redirect functions into Redirect module