[BUGFIX] Correctly parse suhosin configuration

The system environment check does not properly parse the suhosin
configuration option for whitelist.
Fix this by changing the code to be less strict about the actual syntax
of this option.

Resolves: #60925
Releases: 6.3, 6.2
Change-Id: I6797a313cedaaf1895cf7b4fddaae9811341006b
Reviewed-on: http://review.typo3.org/32122
Reviewed-by: Daniel <typo3dev@outlook.com>
Tested-by: Daniel <typo3dev@outlook.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>