Support suggests this file is deprecated in 4.3 and removed as soon as possible (eZP 4.4?):
"The cronjobs/ldapusermanage.php script synchronizes data from the LDAP server to eZ Publish. But this is no longer needed, as issue #15530 has been fixed and data is now synchronized with every login. The cronjob is only needed if you don't have the fix for #15530 yet, and user data has been changed in LDAP or eZ Publish. "
suggests priority HIGH because we should remove deprecated code as soon as possible in general.
although it is not a showstopper for 4.3. release of course.