[TASK] Warning on missing LDAP support should be more visible

Resolves: #61291
Change-Id: Ie21d269db0ea93c49df74f2451e279261df36d34
Reviewed-on: http://review.typo3.org/32544
Reviewed-by: Mario Rimann <typo3-coding@rimann.org>
Reviewed-by: Andreas Fernandez <andreas.fernandez@aspedia.de>
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>