[BUGFIX] Replace tslib_cObj with namespaced version

Change-Id: I29bb0b1d6bfa226b09d162a3c0ad5d0a6ac76533
Reviewed-on: http://review.typo3.org/35336
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>