[BUGFIX] #5174 Avoid feInterface deprecation warnings in 6.2

Change-Id: Idcae8f61f4799f45ca12f0dd8c6d3360f9604417
Reviewed-on: http://review.typo3.org/34574
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>