[BUGFIX] Make recycler PHP 7.2 compatible

Change-Id: I36167b0a8b61532adbafea93c88c93097ea52d73
Resolves: #83297
Releases: master, 8.7, 7.6
Reviewed-on: https://review.typo3.org/55042
Reviewed-on: https://review.typo3.org/55047


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>