[BUGFIX] #5174 Avoid feInterface deprecation warnings in 6.2

Change-Id: I668a94738b1b182eff084daa73b0abcfb20ee0cf
Reviewed-on: http://review.typo3.org/34575
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>