[BUGFIX] Ensure no PHP warning is thrown if legacy code is used

When no constant is given (due to old OS),
a PHP warning is now triggered due to PHP 7.2. This is
overcome to use the polyfill functionality instead then.

Resolves: #88443
Releases: master, 9.5
Change-Id: I5ac673f10bc1421e543b8f969a0111e9bbc9c11e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/60844


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Michael Waack <m.waack@i-d.de>
Tested-by: Thomas Anders <me@naderio.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Michael Waack <m.waack@i-d.de>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Reviewed-by: Thomas Anders <me@naderio.de>
Reviewed-by: Benni Mack <benni@typo3.org>