getLoginURL doesn't generate absolute URL paths in Drupal

CRM_Utils_System_Drupal->getLoginURL is supposed to generate a login URL - but it calls CRM_Utils_DrupalBase->url without specifying it should be an absolute URL. Since this function seems mostly to exist to generate login URLs for e-mail templates, this should always be an absolute URL.

I'll submit a patch for code review as soon as my client tests it - but it's a simple matter of this:
return url('user', array('query' => $query));

to this:
return url('user', array('query' => $query), TRUE);

Presumably it should be changed for Drupal 6 and 8 as well.